Q. For a diffraction grating with 500 lines per mm, what is the angle of the first order maximum for light of wavelength 600 nm?
A.
30 degrees
B.
45 degrees
C.
60 degrees
D.
15 degrees
Show solution
Solution
Using the grating equation d sin θ = nλ, where d = 1/500000 m, n = 1, and λ = 600 x 10^-9 m, we find θ ≈ 30 degrees.
Correct Answer:
A
— 30 degrees
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Q. For a diffraction pattern produced by a single slit, how does the width of the central maximum compare to the other maxima?
A.
Wider than all other maxima
B.
Narrower than all other maxima
C.
Equal to all other maxima
D.
None of the above
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Solution
The central maximum in a single-slit diffraction pattern is wider than all other maxima.
Correct Answer:
A
— Wider than all other maxima
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Q. For a diffraction pattern produced by a single slit, how does the width of the central maximum change if the slit width is halved?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
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Solution
If the slit width is halved, the width of the central maximum increases because the angle for the first minimum increases.
Correct Answer:
A
— Increases
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Q. For a single slit of width 'a', what is the angular position of the first minimum?
A.
λ/a
B.
a/λ
C.
sin θ = λ/a
D.
tan θ = λ/a
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Solution
The angular position of the first minimum is given by sin θ = λ/a.
Correct Answer:
C
— sin θ = λ/a
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Q. If a light wave passes through a narrow slit and produces a diffraction pattern, what happens to the intensity of the central maximum compared to the other maxima?
A.
It is the same
B.
It is greater
C.
It is lesser
D.
It is zero
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Solution
The intensity of the central maximum is greater than that of the other maxima in a diffraction pattern.
Correct Answer:
B
— It is greater
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Q. If light of wavelength 500 nm passes through a diffraction grating with 1000 lines/mm, what is the angle for the first-order maximum?
A.
30 degrees
B.
60 degrees
C.
45 degrees
D.
15 degrees
Show solution
Solution
Using the grating equation d sin(θ) = mλ, where d = 1/1000 mm = 1 x 10^-6 m, for m=1, we find θ ≈ 30 degrees.
Correct Answer:
A
— 30 degrees
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Q. If the distance between the slits in a double-slit experiment is increased, what happens to the interference pattern?
A.
Fringe width increases
B.
Fringe width decreases
C.
Fringe intensity increases
D.
Fringe intensity decreases
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Solution
Increasing the distance between the slits decreases the fringe width, as fringe width is inversely proportional to the slit separation.
Correct Answer:
B
— Fringe width decreases
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Q. If the slit width is equal to the wavelength of light used, what is the expected diffraction pattern?
A.
No diffraction
B.
Single maximum
C.
Wide central maximum
D.
Narrow central maximum
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Solution
When the slit width is equal to the wavelength, a wide central maximum is observed due to significant diffraction.
Correct Answer:
C
— Wide central maximum
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Q. If the slit width is halved in a single-slit diffraction experiment, what happens to the angular width of the central maximum?
A.
It doubles
B.
It halves
C.
It remains the same
D.
It quadruples
Show solution
Solution
Halving the slit width increases the angular width of the central maximum, making it double.
Correct Answer:
A
— It doubles
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Q. If the slit width is halved in a single-slit diffraction experiment, what happens to the width of the central maximum?
A.
It doubles
B.
It halves
C.
It remains the same
D.
It quadruples
Show solution
Solution
If the slit width is halved, the width of the central maximum doubles, as it is inversely proportional to the slit width.
Correct Answer:
A
— It doubles
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Q. If the wavelength of light used in a diffraction experiment is halved, what happens to the position of the minima?
A.
They move closer together
B.
They move further apart
C.
They remain unchanged
D.
They disappear
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Solution
Halving the wavelength causes the minima to move closer together, as the angle for minima is directly proportional to the wavelength.
Correct Answer:
A
— They move closer together
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Q. If the wavelength of light used in a diffraction experiment is halved, what happens to the angular position of the first minimum in a single-slit diffraction pattern?
A.
It remains the same
B.
It doubles
C.
It halves
D.
It quadruples
Show solution
Solution
Halving the wavelength will halve the angle for the first minimum, as the position of minima is directly proportional to the wavelength.
Correct Answer:
C
— It halves
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Q. If the wavelength of light used in a diffraction experiment is halved, what happens to the position of the first diffraction minimum?
A.
It moves closer to the center
B.
It moves further from the center
C.
It remains unchanged
D.
It disappears
Show solution
Solution
Halving the wavelength results in the first minimum moving closer to the center, as the position of minima is directly related to the wavelength.
Correct Answer:
A
— It moves closer to the center
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Q. If the wavelength of light used in a diffraction experiment is increased, what happens to the diffraction pattern?
A.
It becomes sharper
B.
It becomes broader
C.
It remains unchanged
D.
It disappears
Show solution
Solution
Increasing the wavelength results in a broader diffraction pattern as the angles for minima and maxima increase.
Correct Answer:
B
— It becomes broader
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Q. In a diffraction grating, if the number of slits is increased, what happens to the sharpness of the maxima?
A.
Sharpness increases
B.
Sharpness decreases
C.
No effect
D.
Maxima disappear
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Solution
Increasing the number of slits in a diffraction grating increases the sharpness of the maxima due to constructive interference.
Correct Answer:
A
— Sharpness increases
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Q. In a diffraction grating, what is the relationship between the angle of diffraction and the order of the maximum?
A.
Directly proportional
B.
Inversely proportional
C.
Independent
D.
Exponential
Show solution
Solution
The angle of diffraction is directly proportional to the order of the maximum in a diffraction grating.
Correct Answer:
A
— Directly proportional
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Q. In a diffraction pattern, how does the intensity of the maxima compare to the minima?
A.
Maxima are always brighter than minima
B.
Minima have the same intensity as maxima
C.
Minima are always darker than maxima
D.
Intensity is uniform throughout
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Solution
In a diffraction pattern, the minima are always darker than the maxima, which have higher intensity.
Correct Answer:
C
— Minima are always darker than maxima
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Q. In a diffraction pattern, if the first minimum occurs at an angle of 30°, what is the ratio of the slit width to the wavelength?
A.
1:2
B.
1:√3
C.
√3:1
D.
2:1
Show solution
Solution
Using the condition for the first minimum a sin(30°) = λ, we find the ratio a/λ = 1/√3.
Correct Answer:
B
— 1:√3
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Q. In a diffraction pattern, the intensity of the central maximum is how many times that of the first minimum?
A.
Zero
B.
One
C.
Infinity
D.
Two
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Solution
The intensity of the central maximum is theoretically infinite compared to the first minimum, which has zero intensity.
Correct Answer:
C
— Infinity
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Q. In a diffraction pattern, the intensity of the central maximum is typically:
A.
Zero
B.
Minimum
C.
Maximum
D.
Constant
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Solution
The intensity of the central maximum in a diffraction pattern is at its maximum compared to other maxima.
Correct Answer:
C
— Maximum
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Q. In a diffraction pattern, what does the intensity of the central maximum depend on?
A.
Wavelength only
B.
Slit width only
C.
Both wavelength and slit width
D.
Distance from the slit
Show solution
Solution
The intensity of the central maximum in a diffraction pattern depends on both the wavelength of light and the slit width.
Correct Answer:
C
— Both wavelength and slit width
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Q. In a diffraction pattern, what does the term 'fringe separation' refer to?
A.
Distance between two minima
B.
Distance between two maxima
C.
Distance between a maximum and a minimum
D.
None of the above
Show solution
Solution
Fringe separation refers to the distance between two consecutive maxima in a diffraction pattern.
Correct Answer:
B
— Distance between two maxima
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Q. In a diffraction pattern, what does the term 'order of diffraction' refer to?
A.
The number of slits used
B.
The number of maxima observed
C.
The wavelength of light used
D.
The distance to the screen
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Solution
The order of diffraction refers to the number of maxima observed in the diffraction pattern, with the central maximum being the zeroth order.
Correct Answer:
B
— The number of maxima observed
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Q. In a diffraction pattern, what is the ratio of the intensity of the central maximum to that of the first minimum?
A.
1:0
B.
1:1
C.
1:2
D.
1:4
Show solution
Solution
The intensity of the central maximum is typically much greater than that of the first minimum, often approximated as 1:4.
Correct Answer:
D
— 1:4
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Q. In a double-slit experiment, if the distance between the slits is doubled, what happens to the fringe separation on the screen?
A.
It doubles
B.
It halves
C.
It remains the same
D.
It quadruples
Show solution
Solution
The fringe separation is inversely proportional to the distance between the slits; thus, if the distance is doubled, the fringe separation halves.
Correct Answer:
B
— It halves
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Q. In a double-slit experiment, if the distance between the slits is halved, what happens to the fringe separation on the screen?
A.
It doubles
B.
It halves
C.
It remains the same
D.
It quadruples
Show solution
Solution
The fringe separation is inversely proportional to the distance between the slits; halving the distance doubles the fringe separation.
Correct Answer:
A
— It doubles
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Q. In a double-slit experiment, if the wavelength of light is increased, what happens to the distance between the fringes?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
Show solution
Solution
The distance between the fringes increases with an increase in wavelength, as fringe separation is directly proportional to wavelength.
Correct Answer:
A
— Increases
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Q. In a double-slit experiment, what is the effect of increasing the distance between the slits on the fringe width?
A.
Fringe width increases
B.
Fringe width decreases
C.
Fringe width remains constant
D.
Fringe width becomes zero
Show solution
Solution
Increasing the distance between the slits increases the fringe width because the angle of diffraction increases.
Correct Answer:
A
— Fringe width increases
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Q. In a single-slit diffraction experiment, what happens to the width of the central maximum as the slit width decreases?
A.
It increases
B.
It decreases
C.
It remains the same
D.
It becomes zero
Show solution
Solution
As the slit width decreases, the central maximum becomes wider due to increased diffraction.
Correct Answer:
A
— It increases
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Q. In a single-slit diffraction pattern, how does the intensity of the central maximum compare to the first minimum?
A.
Equal
B.
Twice
C.
Four times
D.
Half
Show solution
Solution
The intensity of the central maximum is four times that of the first minimum in a single-slit diffraction pattern.
Correct Answer:
C
— Four times
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Showing 1 to 30 of 76 (3 Pages)
Diffraction MCQ & Objective Questions
Diffraction is a crucial concept in physics that plays a significant role in various examinations. Understanding diffraction helps students grasp the behavior of waves, which is essential for scoring well in both school and competitive exams. Practicing MCQs and objective questions on diffraction not only enhances conceptual clarity but also boosts confidence in tackling important questions during exams.
What You Will Practise Here
Fundamentals of diffraction and its significance in wave theory
Types of diffraction: Fresnel and Fraunhofer diffraction
Key formulas related to diffraction patterns and calculations
Understanding diffraction gratings and their applications
Diagrams illustrating diffraction patterns and their characteristics
Real-life applications of diffraction in technology and science
Common problems and solutions related to diffraction phenomena
Exam Relevance
Diffraction is a topic that frequently appears in CBSE, State Boards, NEET, and JEE examinations. Students can expect questions that test their understanding of diffraction patterns, calculations involving diffraction gratings, and the application of key formulas. Common question patterns include numerical problems, conceptual questions, and diagram-based queries, making it essential for students to be well-prepared.
Common Mistakes Students Make
Confusing Fresnel and Fraunhofer diffraction and their respective conditions
Misapplying formulas related to diffraction without understanding their derivation
Overlooking the significance of wavelength in determining diffraction patterns
Failing to interpret diagrams correctly, leading to incorrect answers
FAQs
Question: What is diffraction in simple terms?Answer: Diffraction is the bending of waves around obstacles and the spreading of waves when they pass through small openings.
Question: How can I improve my understanding of diffraction for exams?Answer: Regular practice of diffraction MCQ questions and reviewing key concepts will enhance your understanding and retention of the topic.
Start solving practice MCQs on diffraction today to strengthen your grasp of this important topic and boost your exam readiness. Remember, consistent practice is the key to success!
