Question

$C,V_s,V_0$ and $f$ are velocity of sound in air, velocity of source of sound, velocity of observer and frequency of sound wave, respectively. What will be the apparent frequency felt by the observer if the source of sound moving towards the stationary observer?

• A. $f\left[\frac{C}{C-V_o}\right]$
• B. $f\left[\frac{C}{C-V_s}\right]$
• C. $f\left[\frac{C-V_s}{C}\right]$
• D. $f\left[\frac{c}{c-v_o}\right]$

Answer 1

The correct option is B

$f\left[\frac{C}{C-V_s}\right]$

Correct option is B: $f\left[\frac{C}{C-V_s}\right]$

Explanation:

1. Doppler effect in physics is defined as the increase (or decrease) in the frequency of sound, light, or other waves as the source and observer move towards (or away from) each other.
2. When the source of sound is moving towards the stationary and observer, the apparent frequency felt by the observer is given by $f\left[\frac{C}{C-V_s}\right]$.

Hence, option B is the correct option.