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Saturday, 31 October

JEE Main 2020 · PhysicsMultiple choiceSingle correctMediumCalculation

JEE Main 5 September 2020, Shift 1, Physics Q10

Question 10 of 75 in this shift, Physics question 10 of 25.

Assume that the displacement (s) of air is proportional to the pressure difference (Δ\Deltap) created by a sound wave. Displacement (s) further depends on the speed of sound (vv), density of air (ρ\rho) and the frequency (ff). If Δ\Deltap~10Pa, vv~300 m/s, ρ\rho~1 kg/m3^3 and ff~1000 Hz, then s will be of the order of (take the multiplicative constant to be 1)
  1. (1)10 mm
  2. (2)1 mm
  3. (3)110\frac{1}{10} mm
  4. (4)3100\frac{3}{100} mmOfficial answer

Official answer

Option 4

NTA final key (Sep 2020).

Chapter
Units and Measurements
Topic
No close match in our taxonomy
Idea tested
No close match in our taxonomy

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.