## Young’s double slit experiment- MCQ-Basic

Physics is an important subject in preparation for various Competitive exams. To keep a track of your preparation we have designed a small quiz of 10 Basic Level Questions on Young’s double slit experiment.You have 10 minutes to solve the quiz, click the start timer button in order to start the timer and then click on submit button at the end to submit the quiz and view your scores and correct answers.

Q1. In a Young’s double slit experiment, the separation between the two slits is 0.9 mm and the fringes are observed one metre away. If it produces the second dark fringe at a distance of 1 mm from the central fringe, the wavelength of monochromatic source of light used is

•  500 nm
•  600 nm
•  450 nm
•  400 nm

600 nm

Q2. In a Young’s double-slit experiment the fringe width is 0.2 mm. If the wavelength of light used is increased by 10% and the separation between the slits is also increased by 10%, the fringe width will be

•  0.20 mm
•  0.401 mm
•  0.242 mm
•  0.165 mm

0.20 mm

Q3. In Young’s experiment, the distance between the slits is reduced to half and the distance between the slit and screen is doubled, then the fringe width

•  Will not change
•  Will become half
•  Will be doubled
•  Will become four times

Will become four times

Q4. In an interference experiment, third bright fringe is obtained at a point on the screen with a light of 700 nm. What should be the wavelength of the light source in order obtain 5th bright fringe at the same point

•  500 nm
•  630 nm
•  750 nm
•  420 nm

420 nm

Q5. If the separation between slits in Young’s double slit experiment is reduced to 1/3rd ,the fringe width becomes n times. The value of n

•  3
•  1/3
•  9
•  1/9

3

Q6. In a Young’s double slit experiment, the source illuminating the slits is changed from blue to violet. The width of the fringes

•  Increases
•  Decreases
•  Becomes unequal
•  Remains constant

Decreases

Q7. In Young’s double slit experiment, the intensity of light coming from the first slit is double the intensity from the second slit. The ratio of the maximum intensity to the minimum intensity on the interference fringe pattern observed is

•  34
•  40
•  25
•  38

34

Q8. In Young’s double slit experiment the wavelength of light was changed from 7000Ă… to 3500Ă…. While doubling the separation between the slits which of the following is not true for this experiment

•  The width of the fringes changes
•  The colour of bright fringes changes
•  The separation between successive bright fringes changes
•  The separation between successive dark fringes remains unchanged

The separation between successive dark fringes remains unchanged

Q9. In Young’s double slit experiment, the central bright fringe can be identified

•  By using white light instead of monochromatic light
•  As it is narrower than other bright fringes
•  As it is wider than other bright fringes
•  As it has a greater intensity than the other bright fringes

By using white light instead of monochromatic light

Q10. Interference was observed in interference chamber when air was present, now the chamber is evacuated and if the same light is used, a careful observer will see

•  No interference
•  Interference with bright bands
•  Interference with dark bands
•  Interference in which width of the fringe will be slightly increased

Interference in which width of the fringe will be slightly increased

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