Page 151 - Understanding NCERT Science 09
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13. A sound wave travels at a speed of 339 m s . If its wavelength
–1
is 1.5 cm, what is the frequency of the wave? Will it be
audible?
14. What is reverberation? How can it be reduced?
15. What is loudness of sound? What factors does it depend on?
16. How is ultrasound used for cleaning?
17. Explain how defects in a metal block can be detected using
ultrasound.
SOUND 139
Rationalised 2023-24
