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Friday, 9 October

JEE Main 2022 · PhysicsNumerical answerNumerical valueMediumCalculation

JEE Main 28 July 2022, Shift 1, Physics Q57

Question 57 of 90 in this shift, Physics question 27 of 30, Section B.

The 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 towards a hill from which an echo is heard by the train driver. Velocity of sound in air is 330 m/s.

Official answer

340

NTA final key (2022 Session 2).

Chapter
Waves
Topic
Doppler Effect
Idea tested
Moving Reflector Echo

Same idea in other shifts

Asked 2× in all
  1. 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

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 42 of the 174 JEE Main shifts held from 2017 to 2026.