The speed of sound in air is $$\(330 \mathrm{~m} / \mathrm{s}\)$$. The speed of ultraviolet waves in air is $$\(300000000 \mathrm{~m} / \mathrm{s}\)$$. Which row gives a possible frequency and speed of an ultrasound wave in air?
A.
B.
C.
D.
Exam No：0625_w17_qp_13 Year：2017 Question No：25
Answer:
C
Knowledge points:
3.4.1 Describe the production of sound by vibrating sources
3.4.10 State typical values of the speed of sound in gases, liquids and solids
3.4.2 Describe the longitudinal nature of sound waves
3.4.3 State that the approximate range of audible frequencies for a healthy human ear is 20 Hz to 20000 Hz
3.4.4 Show an understanding of the term ultrasound
3.4.5 Show an understanding that a medium is needed to transmit sound waves
3.4.6 Describe an experiment to determine the speed of sound in air
3.4.7 Relate the loudness and pitch of sound waves to amplitude and frequency
3.4.8 Describe how the reflection of sound may produce an echo
3.4.9 Describe compression and rarefaction
Solution:
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