Solutions to the Quiz on Waves
Question 1: Which one of the following waves is a longitudinal wave?
- Water waves
- Sound waves
- Electromagnetic waves
- None of the above.
Answer: Sound waves
Question 2: What is the period of an ultrasound in a tissue in which the speed of sound is 1600 m/s
and the wavelength of the scanner is 4× 10− 4 m.
- 2.5 10− 7 s
- 2.5 10− 6 s
- 3.5 10− 7 s
- 2.5 10− 8 s
Answer: 2.5 10− 7 s
Explanation: wave speed = frequency × wavelegth ⇒ v = f × λ and then f = v / λ = 1600 m/s / 4× 10− 4 = 4× 106 Hz
Period T = 1 / f = 1 / (4× 106 Hz) = 2.5 10− 7 s.
Question 3: If the speed of a wave remains constant, what happens to the frequency when the wave length is halved?
Answer: Doubled
Explanation: wave speed = frequency × wavelegth ⇒ f = v / λ
Question 4: Based on the wave below having a frequency of 50 Hz, find its speed.
200 m/s
300 m/s
350 m/s
400 m/s
Answer: 300 m/s
Explanation: wave speed = frequency × wavelegth = 50 Hz × 6 m = 300 m/s.
Question 5: The vibrations in a transvers wave move in a direction ________________ to the wave motion.
- parallel
- perpendicular
- opposite
- upward
- downward
Answer: perpendicular
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Date of last modification: 2022