Q. A spectral line of wavelength is observed in the directions along the opposite edges of the solar disc along its equator. A difference in wavelength equal is observed. Period of Sun's revolution around its own axis will be about (Radius of sun ):

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30 days

24 hours

25 days

365 days

Solution:

By Doppler's effect, we have

Change in wavelength for two edges
Total change is

Time period of revolution is given as

days
days days

Questions from Wave Optics

1. Which of the following phenomena support the wave theory of light ?
(a) scattering
(b) interference
(c) diffraction
(d) velocity of light in a denser medium is less than the velocity of light in the rarer medium

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2. In Young's double slit experiment, how many maxima can be obtained on a screen (including central maxima), if (where is the wavelength of light)?

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3. Light of wavelength is incident normally on a slit of width . The angular width of central maxima in the diffraction pattern is (measured from minimum to minimum)

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4. Using monochromatic light of wavelength , an experimentalist sets up the Young's double slit experiment in three ways as shown.
If she observes that y = the wavelength of light used is :

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5. At two points P and Q on a screen in Young's double slit experiment, waves from slits and have a path difference of 0 and respectively. The ratio of intensities at P and Q will be :

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