Wave Jeopardy

unit 1

100

1. What do waves transfer?

Energy

200

2. Transverse waves vibrate parallel / at right angles to the direction of energy transfer

• Transverse waves vibrate at right angles to the direction of energy transfer

300

3. Sound travels a distance of 686m in a time of 2 seconds. Calculate the speed of sound.

F = 1 / t
= 0.5Hz

v= 0.5 x 686
= 343m/s

400

4. Radio waves are electromagnetic waves. Describe how radio waves are different from sound waves.

1 – Radio waves are transverse waves and sound waves are longitudinal

2 – Radio waves travel at a right angle to the direction of travel

500

Design an experiment to measure the speed of the sound.

v=s/t, s-, t-, draw pictures.

unit 2

100

1.How many EM waves are there?

• Seven

200

2. All EM waves are transverse/longitudinal?

Transverse.

300

3. A thunderstorm is happening near. The thunder is heard a time of 15 seconds after the lightning. How far away is the thunderstorm?

Sound travels at 340m/s

340 x 15 = 2600m

400

4. List the EM waves in order (from longest wavelength to shortest wavelength). 

• Radio, Microwaves, Infrared, Visible light, Ultraviolet, X-ray, Gamma

500

5. Which three EM waves are ionising? What does ionising mean and what is it dangerous?

• Gamma, UV and Xray. Can cause atoms to become charged which can damage body cells and tissues or cause cancer.

unit 3

100

1. The imaginary line at right angle to any surface is called?

Normal.

200

2. The angle between the normal ray and the incident ray is called?

The angle of incidence.

300

3. State what happens when light hits rough surface.

Light is reflected from a rough surface in all directions.

400

4. State the law of reflection.

Angle of incidence (°) = angle of reflection (°)

i (°) = r (°)

500

5. What happens when light travels from air into a glass block?

• It refracts towards the normal as glass is more dense than air.

unit 4

100

1. Which EM wave has the most energy?

• Gamma

200

2. What is the wave speed equation?

v = f × λ

300

3. What are microwaves used for?

Satellite communication (as they can travel through ionosphere) and for cooking food.

400

4. What is infrared used for?

Electrical heaters, cooking food and infrared cameras

500

5. What happens when light travels from a glass block into air?

• It refracts away from the normal as air is less dense than glass.

unit 5

100

1. what is the refractive index equation?

n= sin i/ sin r

200

2. Total internal reflection happens when the angle of incidence is? 

when the angle is larger than the critical angle of the medium.

300

3. what is the name of the angle that seperates reflection and refraction?

Critical angle.

400

4. How to calculate the critical angel?

sin c=1/n 

500

5. State a use of total internal reflection.

Optical Fiber.