Vibrations and waves questions | form five Physics

a)i) Provide one evidence which proves that sound is a wave

2. Why thunder of lightning is heard some moments after seeing the flash?

b)i) What is doppler effect?

2. The cyclist moving at 10m/s and the railway train at 20m/s are approaching each other . If the engine driver sounds a warning siren at a frequency of 480Hz; calculate the frequency of the note heard by the cyclist before and after the train has passed away.

c) Two sheets of a polaroid are lined up so that their polarization directions are initially parallel.When one sheet is rotated;

1. How does the transmitted light intensity vary with the angle between the polarization directions of the polaroid?
2. What angle must the polaroid be rotated to reduce the light intensity by 50%?

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Give the meaning of the terms wave function longitudinal wave and transverse wave.

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The equation of a progressive wave travelling in the +x – direction is given by . show that the maximum velocity, .

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What is meant by diffraction grating?

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1. A diffraction grating has 500 lines per millimetre when used with monochromatic light of wavelength 6x10^-7m at normal incidence. Determine the angle at which the bright diffraction images will be observed.
2. Why other orders of image in (ii) can not be observed?

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UNSOLVED