JEE Main 2022 · PhysicsNumerical answerNumerical valueMediumCalculation

JEE Main 30 June 2022, Shift 1, Physics Q52

Question 52 of 90 in this shift, Physics question 22 of 30, Section B.

An employee of a factory moving away from his workplace by a car listens to the siren of the factory. He drives the car at the speed of 72

\mathrm{kmh^{-1}}

in the direction of wind which is blowing at 72

\mathrm{kmh^{-1}}

speed. Frequency of siren is 720 Hz. The employee hears an apparent frequency of __________ Hz. (Assume speed of sound to be 340

\mathrm{ms^{-1}}

)

Official answer

680

NTA final key.

Chapter: Waves
Topic: Doppler Effect
Idea tested: Effect of Wind Velocity

Same topic in other shifts

All Doppler Effect questions

6 Apr 2023, Shift 1 · Q51A person driving car at a constant speed of 15 m/s is approaching a vertical wall. The person notices a change of 40 Hz in the frequency…MediumNumerical value
8 Apr 2023, Shift 1 · Q31The engine of a train moving with speed $10\ \mathrm{ms^{-1}}$ towards a platform sounds a whistle at frequency $400\ \mathrm{Hz}$ . The…EasySingle correct
11 Apr 2023, Shift 2 · Q31A car P travelling at $20\ \mathrm{ms^{-1}}$ sounds its horn at a frequency of $400\ \mathrm{Hz}$ . Another car Q is travelling behind the…MediumSingle correct
25 Jul 2022, Shift 1 · Q55An observer is riding on a bicycle and moving towards a hill at $18\ \mathrm{km\,h^{-1}}$ . He hears a sound from a source at some distance…MediumNumerical value
26 Jul 2022, Shift 1 · Q54When a car is approaching the observer, the frequency of horn is 100 Hz. After passing the observer, it is 50 Hz. If the observer moves…MediumNumerical value
28 Jul 2022, Shift 1 · Q57The frequency of echo will be __________ Hz if the train blowing a whistle of frequency 320 Hz is moving with a velocity of 36 km/h…MediumNumerical value

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.