Quiz on Waves: Solutions
In Brief
This page includes solutions to the set of questions related to the
Waves.
This helps learners to ensure their learning on
aspects of pysics in general but also Waves in particular.
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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