When water waves pass through a gap they diffract. The diagrams show wavefronts approaching a narrow gap. In which diagram will the diffraction be least?
A.
B.
C.
D.
Exam No：0625_s19_qp_21 Year：2019 Question No：20
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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