16:I[8216,["972","static/chunks/972-b28da0de92681928.js","47","static/chunks/47-a7f06e9eda1ac756.js","115","static/chunks/app/%5Bexam%5D/questions/%5Byear%5D/%5Bsubject%5D/%5Bchapter%5D/%5BquestionId%5D/page-7b6f0a12b9cc0206.js"],"BackButton"] 17:I[1553,["972","static/chunks/972-b28da0de92681928.js","47","static/chunks/47-a7f06e9eda1ac756.js","115","static/chunks/app/%5Bexam%5D/questions/%5Byear%5D/%5Bsubject%5D/%5Bchapter%5D/%5BquestionId%5D/page-7b6f0a12b9cc0206.js"],"QuestionViewer"] 15:T452,{"@context":"https://schema.org","@type":"Quiz","name":"Mht Cet 2025 Waves PYQ with Solution","url":"https://pyq-test-series-platform-alsjdcxu2-sameers-projects-41c5a71e.vercel.app/mht-cet/questions/2025/physics/waves/merjo3c5","educationalLevel":"Entrance exam preparation","about":"Mht Cet / Physics / Waves","hasPart":{"@type":"Question","name":"Mht Cet 2025 Waves PYQ with Solution","text":"When source of sound moves towards a stationary observer, the apparent frequency heard by him","eduQuestionType":"mcq","acceptedAnswer":{"@type":"Answer","text":"B"},"comment":{"@type":"Comment","text":"When a source of sound moves towards a stationary observer, the Doppler effect takes place. According to the NCERT formula: If the source moves towards a stationary observer, the apparent frequency f' heard by the observer is: f' = \\frac{v}{v - v_s} f where, f = actual frequency of the source v = speed of sound in air v_s = speed of the source towards the observer Step-by-step reasoning: Since the denominator v - v_s is less than v, f' > f. \\implies The apparent frequency increases . The wavele..."}}}18:T44c,

When a source of sound moves towards a stationary observer, the Doppler effect takes place.

According to the NCERT formula:

If the source moves towards a stationary observer, the apparent frequency $f'$ heard by the observer is:

$$ f' = \frac{v}{v - v_s} f $$

where,

$f$ = actual frequency of the source

$v$ = speed of sound in air

$v_s$ = speed of the sour

Waves

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