Question

The properties of ultrasound that make it useful, are:
(a) High power and high speed
(b) High power and good directivity
(c) High frequency and high speed
(d) High frequency and bending around the objects

  • Propagation of Sound Waves Class 9 ICSE
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Answer

(b) High power and good directivity

Reason — Properties of ultrasound that make it useful to us are:

  1. The energy carried by ultrasound is very high.
  2. The ultrasound can travel along a well defined straight path. It does not bend appreciably at the edges of an obstacle because of it’s small wavelength (i.e., it has high directivity).

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