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:T4fd,{"@context":"https://schema.org","@type":"Quiz","name":"Jee Advanced 2005 Waves PYQ with Solution","url":"https://pyq-test-series-platform-alsjdcxu2-sameers-projects-41c5a71e.vercel.app/jee-advanced/questions/2005/physics/waves/1lgdvyzix","educationalLevel":"Entrance exam preparation","about":"Jee Advanced / Physics / Waves","hasPart":{"@type":"Question","name":"Jee Advanced 2005 Waves PYQ with Solution","text":"A whistling train approaches a junction. An observer standing at the junction observes the frequency to be 2.2 kHz and 1.8 kHz of the approaching and the receding train. Find the speed of the train (speed of sound = 300 m/s).","eduQuestionType":"mcq","acceptedAnswer":{"@type":"Answer","text":"A"},"comment":{"@type":"Comment","text":"Let the speed of the train be V_t, Let v be the actual frequency of the whistle. Speed of sound \\mathrm{V}_{s}=300 \\mathrm{~m} / \\mathrm{s} While train is approaching, v_{2}=2.2 \\mathrm{~kHz} =2.2\\times10^3 Hz v_{2}=\\frac{\\mathrm{V}_{s}}{\\mathrm{~V}_{s}-\\mathrm{V}_{t}} \\times v 2.2 \\times 10^{3}=\\frac{\\mathrm{V}_{s}}{\\mathrm{~V}_{s}-\\mathrm{V}_{t}} \\times v=\\frac{300}{300-\\mathrm{V}_{t}} \\times v ...... (i) While train is receding, v_1=1.8 kHz = 1.8\\times10^3 Hz {v_1} = {{{V_s}} \\over {{V_s} +..."}}}18:T453,

Let the speed of the train be V$$_t$$,

Let $$v$$ be the actual frequency of the whistle.

Speed of sound $$\mathrm{V}_{s}=300 \mathrm{~m} / \mathrm{s}$$

While train is approaching, $$v_{2}=2.2 \mathrm{~kHz}$$

$$=2.2\times10^3$$ Hz

Waves

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