172954
Assertion (A) : Doppler effect is asymmetric in sound Reason ( $R)$ : In sound. apparent change in frequency depends on the method of inducing relative motion.
1 Both (A) and (R) correct and (R) is the correct explanation of $(A)$
2 Both $(\mathrm{A})$ and $(\mathrm{R})$ correct but $(\mathrm{R})$ is not the correct explanation of $(A)$
3 (A) is correct but (R) is not correct
4 (A) is not correct but (R) is correct
Explanation:
A In sound the Doppler effect is asymmetric even if the relative velocity are the same in both situation. The change in frequency is dependent on whether the source or observer is moving. since, light waves are electromagnetic (so medium do not required). Therefore, Doppler effect in light is symmetric.
