Vibrations and waves questions | form five Physics

The incident parallel light is a monochromatic beam of wavelength 450nm. The two slits A and B have their centres a distance of 0.3mm apart. The screen is situated a distance of 2.0m from the slits.

1. Calculate the spacing between fringes observed on the screen.
2. How would you expect the pattern to change when the slits A and B are each made wider?

Describe the formation of interference patterns by using Newton`s rings experiment.

calculate the radius of curveture of a Plano-convex lens used to produce Newton`s rings with a flat glasss plate if the diameter of the tenth dark ring is 4.48mm, viewed by normally reflected light of wavelength 5.00x10^-7m. What is the diameter of the twentieth bright ring?

Deine the following terms.

1. Damped oscillations
2. Forced oscillations
3. Resonance.

1. What is meant by Doppler effect?
2. Write down three uses of Doppler effect.

A source of sound emits waves of frequency f, and is moving with a speed of u, towards the listener and away from the listener. Derive an expression for apparent frequency f¹ of sound in each case if the velocity of sound wave in air is  V.

A whistle emitting a sound of frequency 440Hz is tied to a string of 1.5m length and rotated with an angular velocity of 20rads¹ in the horizontal plane. Calculate the range of frequencies heard by an observer stationed at a large distance.

A police on duty detects a drop of 10% in the pitch of the horn of a motor car as it crosses him. Calculate the speed of the car.

What is meant by statement that light is plane polarized.

State Brewster`s law.