Vibrations and waves questions | form five Physics

What do you understand by the term interference of waves?

A viewing screen is separated from a double-slit source by 1.2m. The distance between the two slits is 0.030mm. The second order bright fringe (m=2) is 4.5cm from the centre line. Determine the wavelength of the light and the distance between adjacent bright fringes.

Define the term coherent sources of light.

Interference patterns are formed when using Young`s double slit experiment. Mention other three methods that can be used to form interference patterns.

Giving reasons, explain whether either transverse or longitudinal waves could exist, if the vibratory motion causing them were not simple harmonic motion.

A beam of monochromic light of wavelength 680nm in air passes into glass.

Calculate:

1. The speed of light in glass
2. The frequency of light
3. The wavelength of light in glass

Light of wavelength 644nm is incident on a grating with a spacing of 2.00x10^-6m.

1. What is the angle to the normal of a second order maximum?
2. What is the largest number of orders that can be visible?
3. Find the angular separation between the third and fourth order image.?

In a Yoing`s double – slit experiment a total of 23 bright fringes occupying a total distance of 3.9mm were visible in travelling microscope, which was focused on a plane being at a distance of 31cm from the double slit. If the wavelength of light being used was 5.5x10^-7m; determine the separation of the double slit.

When a grating with 300 lines per millimeters is illuminated normally with parallel beam of monochromatic light a second order principal maximum is observed at 18.9^o to the straight through direction. Find the wavelength of the light.

A white light fall on a slit of width `a`; for what value of `a` will be the first minimum of light falling at the angle of 30^o when the wavelength of light is 6500nm?