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LoginA motor cyclist moving with 30 km/ h blows a whistle of 476 Hz towards a cliff. If velocity of sound is 1220 Km/h, the apparent frequency of the echo heard by him is :
Class 12 Physics in Class 12 3 years ago
250 Hz
500 Hz
425 Hz
476 Hz.
`v. = ((1220)/(1220 - 30)) 476 = 488 Hz.`
` therefore` FREQUENCY of reflected wave i.e., ECHO is 488 Hz and observer is moving towards it.
`therefore v.. = ((1220 + 30)/(1220)) 488`= 500 Hz.
hence the correct choice is (b) .
Posted on 11 Dec 2021, this text provides information on Class 12 related to Physics in Class 12. Please note that while accuracy is prioritized, the data presented might not be entirely correct or up-to-date. This information is offered for general knowledge and informational purposes only, and should not be considered as a substitute for professional advice.
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