 µ IB | Wave Basics

10 quick questions

10 minutes maximum! (can you do it in 5?)

1. Which of these waves is NOT an electromagnetic wave?

• B. sound wave.
• C. X-ray
• D. visible light.

2. Which of these answers correctly identifies longitudinal and transverse waves?

 longitudinal Transverse A sound X-ray B visible light X-ray C visible light gamma ray D X-ray visible light

3. An electromagnetic wave of wavelength of approximately 10-2 m is a(n)...

• A. infra-red wave.
• B. sound wave.
• C. microwave.
• D. visible light wave.

4. Waves can be measured in many ways. Which of these answers correctly identifies the units used to measure the wavelength and period of a wave?

 wavelength period A metres Hertz B seconds Hertz C metres seconds D Hertz seconds

5. "The displacement of the medium is parallel to the motion of the wave".

This sentence is describing...

• A. all travelling waves.
• B. all longitudinal waves.
• C. all electromagnetic waves.
• D. all transverse waves.

6. The period of a wave is 0.5 s and the wave speed 100 ms-1. What is the frequency and wavelength of this wave?

• A. f = 2 Hz, λ = 50 m.
• B. f = 5 Hz, λ = 50 m.
• C. f = 2 Hz, λ = 20 m.
• D. f = 5 Hz, λ = 20 m.

7. The graph below shows the displacement of a point on a long spring as a wave passes along it. Which of the 3 statements shown on the right are correct?

• A. I only
• B. I and II.
• C. III only
• D. none of them.
• I. The wave must be a transverse wave.
• II The period is 2 s.
• III. The frequency of the wave is 0.5 Hz.

8. A plastic ball is floating on the sea as a wave goes past. At T=0, the ball is at the top of a wave. Which of the following waves best shows a displacement-time graph of the subsequent motion of the ball? 9&10. The diagram below shows two light rays traveling left to right. 9. These rays are described as being out of      .

10. By how much is the second ray 'out'?