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Photoelectric Effect

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Q. In the photoelectric effect, what is the effect of increasing the wavelength of incident light?
  • A. Increases the kinetic energy of emitted electrons
  • B. Decreases the kinetic energy of emitted electrons
  • C. Has no effect on the photoelectric effect
  • D. Increases the number of emitted electrons
Q. In the photoelectric effect, what is the relationship between the energy of the incident photon and the kinetic energy of the emitted electron?
  • A. K.E. = E_photon - Work function
  • B. K.E. = Work function - E_photon
  • C. K.E. = E_photon + Work function
  • D. K.E. = E_photon * Work function
Q. What happens to the kinetic energy of emitted electrons if the frequency of incident light is increased beyond the threshold frequency?
  • A. It decreases
  • B. It remains constant
  • C. It increases linearly with frequency
  • D. It becomes zero
Q. What happens to the number of emitted electrons if the intensity of light is increased while keeping the frequency above the threshold?
  • A. The number of emitted electrons decreases
  • B. The number of emitted electrons increases
  • C. The energy of each emitted electron increases
  • D. No electrons are emitted
Q. What happens to the number of emitted electrons if the intensity of the light is increased while keeping the frequency above the threshold?
  • A. The number of emitted electrons decreases
  • B. The number of emitted electrons increases
  • C. The energy of each emitted electron increases
  • D. No effect on the number of emitted electrons
Q. What happens to the photoelectric current if the voltage across the electrodes is increased?
  • A. Increases
  • B. Decreases
  • C. Remains constant
  • D. Becomes zero
Q. What happens to the photoelectric effect if the incident light is below the threshold frequency?
  • A. Electrons are emitted
  • B. No electrons are emitted
  • C. Electrons are emitted with low energy
  • D. Electrons are emitted with high energy
Q. What happens to the photoelectric effect if the metal surface is cooled?
  • A. More electrons are emitted
  • B. Fewer electrons are emitted
  • C. No effect on emission
  • D. Electrons are emitted with higher energy
Q. What is the effect of increasing the frequency of incident light on the photoelectric current?
  • A. Increases indefinitely
  • B. Decreases
  • C. Remains constant
  • D. Increases until a threshold frequency is reached
Q. What is the effect of increasing the intensity of light on the energy of emitted electrons in the photoelectric effect?
  • A. It increases the energy
  • B. It decreases the energy
  • C. It does not affect the energy
  • D. It can either increase or decrease the energy
Q. What is the effect of increasing the intensity of light on the energy of emitted photoelectrons?
  • A. Increases energy
  • B. Decreases energy
  • C. No effect on energy
  • D. Energy becomes negative
Q. What is the effect of increasing the intensity of light on the maximum kinetic energy of emitted electrons?
  • A. It increases
  • B. It decreases
  • C. It remains the same
  • D. It becomes zero
Q. What is the effect of increasing the intensity of light on the maximum kinetic energy of the emitted electrons?
  • A. It increases
  • B. It decreases
  • C. It remains the same
  • D. It becomes zero
Q. What is the effect of increasing the wavelength of incident light on the photoelectric effect?
  • A. More electrons are emitted
  • B. Fewer electrons are emitted
  • C. The kinetic energy of emitted electrons increases
  • D. The work function decreases
Q. What is the effect of increasing the wavelength of incident light on the photoelectric current?
  • A. It increases the current
  • B. It decreases the current
  • C. It has no effect
  • D. It stops the current
Q. What is the effect of increasing the work function of a metal on the photoelectric effect?
  • A. More electrons are emitted
  • B. Fewer electrons are emitted
  • C. The frequency of light must be increased
  • D. Both B and C are correct
Q. What is the maximum kinetic energy of photoelectrons emitted if the incident light has a frequency of 8 x 10^14 Hz and the work function is 3 eV?
  • A. 1 eV
  • B. 3 eV
  • C. 5 eV
  • D. 7 eV
Q. What is the maximum kinetic energy of photoelectrons emitted when light of frequency 8 x 10^14 Hz is incident on a metal with work function 3 eV?
  • A. 1 eV
  • B. 3 eV
  • C. 5 eV
  • D. 7 eV
Q. What is the maximum kinetic energy of photoelectrons if the incident light has a frequency of 8 x 10^14 Hz and the work function is 3 eV?
  • A. 1 eV
  • B. 3 eV
  • C. 5 eV
  • D. 7 eV
Q. What is the minimum frequency of light required to eject electrons from a metal surface in the photoelectric effect?
  • A. It depends on the intensity of light
  • B. It is constant for all metals
  • C. It depends on the work function of the metal
  • D. It is equal to the energy of the incident photons
Q. What is the photoelectric effect primarily used for in technology?
  • A. Solar panels
  • B. LEDs
  • C. Lasers
  • D. Television screens
Q. What is the relationship between the frequency of incident light and the number of emitted electrons in the photoelectric effect?
  • A. Directly proportional
  • B. Inversely proportional
  • C. No relationship
  • D. Exponential relationship
Q. What is the relationship between the intensity of light and the energy of individual photons in the photoelectric effect?
  • A. Directly proportional
  • B. Inversely proportional
  • C. Independent
  • D. Depends on frequency
Q. What is the relationship between the number of emitted electrons and the intensity of light in the photoelectric effect?
  • A. Directly proportional
  • B. Inversely proportional
  • C. No relationship
  • D. Exponential relationship
Q. What is the relationship between the stopping potential and the maximum kinetic energy of emitted electrons in the photoelectric effect?
  • A. Stopping potential is directly proportional to the work function
  • B. Stopping potential is directly proportional to the maximum kinetic energy
  • C. Stopping potential is inversely proportional to the frequency
  • D. Stopping potential has no relation to kinetic energy
Q. What is the relationship between the stopping potential and the maximum kinetic energy of the emitted electrons in the photoelectric effect?
  • A. Stopping potential is directly proportional to the work function
  • B. Stopping potential is inversely proportional to the maximum kinetic energy
  • C. Stopping potential is equal to the maximum kinetic energy
  • D. Stopping potential has no relation to the photoelectric effect
Q. What is the relationship between the wavelength of light and the energy of the emitted electrons in the photoelectric effect?
  • A. Energy is directly proportional to wavelength
  • B. Energy is inversely proportional to wavelength
  • C. Energy is independent of wavelength
  • D. Energy is proportional to the square of wavelength
Q. What is the relationship between the work function and the threshold frequency?
  • A. Φ = hν₀
  • B. Φ = ν₀/h
  • C. Φ = h/ν₀
  • D. Φ = ν₀²/h
Q. What is the significance of the photoelectric effect in modern physics?
  • A. It explains the wave nature of light
  • B. It supports the theory of relativity
  • C. It led to the development of quantum mechanics
  • D. It has no significance
Q. What is the threshold frequency for a metal if the work function is 4.5 eV?
  • A. 5.4 x 10^14 Hz
  • B. 6.0 x 10^14 Hz
  • C. 7.2 x 10^14 Hz
  • D. 8.0 x 10^14 Hz
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Photoelectric Effect MCQ & Objective Questions

The Photoelectric Effect is a crucial topic in physics that often appears in school and competitive exams. Understanding this phenomenon not only enhances your conceptual clarity but also boosts your confidence in tackling MCQs and objective questions. Practicing with targeted practice questions can significantly improve your performance in exams, making it essential to focus on important questions related to the Photoelectric Effect.

What You Will Practise Here

  • Definition and explanation of the Photoelectric Effect
  • Key concepts such as threshold frequency and work function
  • Einstein's photoelectric equation and its applications
  • Diagrams illustrating the Photoelectric Effect
  • Numerical problems based on the Photoelectric Effect
  • Real-life applications and implications of the Photoelectric Effect
  • Common experimental setups used to demonstrate the Photoelectric Effect

Exam Relevance

The Photoelectric Effect is a significant topic in various examination boards, including CBSE and State Boards, as well as competitive exams like NEET and JEE. Questions related to this topic often appear in the form of conceptual MCQs, numerical problems, and theoretical explanations. Familiarity with the common question patterns, such as calculations involving energy and frequency, will help you tackle these questions effectively.

Common Mistakes Students Make

  • Confusing the concepts of work function and threshold frequency
  • Misunderstanding the relationship between light frequency and emitted electron energy
  • Overlooking the significance of the photoelectric equation in problem-solving
  • Neglecting the role of intensity in the photoelectric effect

FAQs

Question: What is the Photoelectric Effect?
Answer: The Photoelectric Effect refers to the phenomenon where electrons are emitted from a material when it absorbs light of sufficient frequency.

Question: How is the Photoelectric Effect relevant in modern technology?
Answer: The Photoelectric Effect is fundamental in devices like solar panels and photodetectors, showcasing its practical applications.

Now is the time to enhance your understanding of the Photoelectric Effect! Dive into our practice MCQs and test your knowledge to excel in your exams.

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