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%?

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

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

What is meant by diffraction grating?

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?

State Huygens`s principle of wave contruction.

A lens was placed with a convex surface of radius of curveture 50.0cm in contact with the plane surface such that Newton`s rings were observed when the lens was illuminated with monochromic light. If the radius of the 15^th ring was 2.13mm; dettermine the wavelength.

What do you understand by the terms;

1. Progressive wave
2. Refraction of waves
3. Diffraction of waves
4. Standing wave

Two progressive waves travelling in the opposite direction in the medium are represented by and . If the two progressive waves form a standing wave, determine the resultant amplitude and phase angle formed.

The shortest length of the resonance tube closed at one end which resounds to fork of frequency 256Hz is 31.6cm. The corresponding length for a fork of frequency 384Hz is 20.5cm. Determine the end correction for the tube and the velocity of sound in air.