A diffraction grating has 400 lines per mm and is illuminated normally by monochromatic light of wavelength 6000 Å. Calculate the grating spacing, the angle at which the first-order maximum is seen and the maximum number of diffraction maxima are obtained.
Why is the diffraction of sound waves easier to observe than of the light waves?
When a jet plane is flying on elevation of 1000m the sound level on the ground 4.0 db. What would be the intensity level on the ground when its elevation is as low as 100m?
What happens to the frequency of transverse vibration of a stretched string if its tension is halved and the area of the cross-section of the string is doubled?
When a detonator is exploded on a railway line, an observer standing on the rail 2 km away hears two sounds. What is the time interval between them? (Young's modulus of steel = 2 x 1011 Nm-2, density of steel = 8 x 103 kgm-3, γ=1.4, atmospheric pressure = 105 Nm-2)
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