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Friday, 16 October

JEE Main 2023 · PhysicsNumerical answerNumerical valueMediumCalculation

JEE Main 6 April 2023, Shift 1, Physics Q51

Question 51 of 90 in this shift, Physics question 21 of 30, Section B.

A 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 of his car's horn upon reflection from the wall. The frequency of horn is ____________ Hz. (Given: Speed of sound : 330 m/s)

Official answer

420

NTA final key.

Chapter
Waves
Topic
Doppler Effect
Idea tested
Moving Reflector Echo

Same idea in other shifts

Asked 2× in all
  1. 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 42 of the 174 JEE Main shifts held from 2017 to 2026.