Department of Pre-University Education, KarnatakaPUC Karnataka Science Class 11

# A Listener is at Rest with Respect to the Source of Sound. a Wind Starts Blowing Along the Line Joining the Source - Physics

Short Note

A listener is at rest with respect to the source of sound. A wind starts blowing along the line joining the source and the observer. Which of the following quantities do not change?
(a) Frequency
(b) Velocity of sound
(c) Wavelength
(d) Time period

#### Solution

(a) Frequency
(d) Time period

The frequency does not change. Hence, the time period (inverse of frequency) also remains the same.
Due to wind, the relative velocity of sound changes. Thus, the wavelength also changes so as to keep the frequency the same. (As $v = \nu\lambda$)

Concept: Wave Motion
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#### APPEARS IN

HC Verma Class 11, 12 Concepts of Physics 1
Chapter 16 Sound Waves
MCQ | Q 5 | Page 352