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In a double-slit experiment, if the light source is changed from monochromatic t

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Question: In a double-slit experiment, if the light source is changed from monochromatic to polychromatic, what happens to the interference pattern? (2019)

Options:

  1. Pattern becomes sharper
  2. Pattern becomes broader
  3. Pattern disappears
  4. Pattern remains unchanged

Correct Answer: Pattern becomes broader

Exam Year: 2019

Solution: 

Using polychromatic light results in overlapping patterns of different wavelengths, causing the overall pattern to become broader.

In a double-slit experiment, if the light source is changed from monochromatic t

Practice Questions

Q1
In a double-slit experiment, if the light source is changed from monochromatic to polychromatic, what happens to the interference pattern? (2019)
  1. Pattern becomes sharper
  2. Pattern becomes broader
  3. Pattern disappears
  4. Pattern remains unchanged

Questions & Step-by-Step Solutions

In a double-slit experiment, if the light source is changed from monochromatic to polychromatic, what happens to the interference pattern? (2019)
  • Step 1: Understand what monochromatic light is. It is light of a single wavelength (color).
  • Step 2: Understand what polychromatic light is. It is light that contains multiple wavelengths (colors).
  • Step 3: In a double-slit experiment, monochromatic light creates a clear interference pattern with distinct bright and dark fringes.
  • Step 4: When you switch to polychromatic light, you introduce multiple wavelengths at once.
  • Step 5: Each wavelength creates its own interference pattern, which overlaps with the others.
  • Step 6: The overlapping patterns from different wavelengths cause the overall interference pattern to become broader and less distinct.
  • Interference Patterns – The phenomenon where waves superpose to form a resultant wave, leading to bright and dark fringes.
  • Monochromatic vs. Polychromatic Light – Monochromatic light consists of a single wavelength, while polychromatic light contains multiple wavelengths, affecting the interference pattern.
  • Wavelength and Pattern Width – Different wavelengths in polychromatic light lead to varying fringe spacing, resulting in a broader overall interference pattern.
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