A) \[{{v}_{1}}=0\]
B) \[{{v}_{1}}=0.1v\]
C) \[{{v}_{1}}=-0.1\text{ }v\]
D) \[{{v}_{1}}=10\text{ }v\]
Correct Answer: A
Solution :
Given: Actual frequency of horn \[=v\] Apparent frequency perceived by observer \[v=v+{{v}_{1}}\] Velocity of vehicle \[{{\upsilon }_{s}}=30\text{ }m/s\] Velocity of sound in air \[\upsilon =300\text{ }m/s\] Dopplers effect of sound is valid only if source and observer are both in relative motion. As the source is moving in a direction perpendicular to the straight line which joins the observer hence, there is no relative motion between them. Therefore, Dopplers effect will not occur. Thus, \[{{v}_{1}}=0\]
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