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NEET
Exam
NEET
Subject
Physics
Chapter
Waves and Sound

NEET · Physics · Waves and Sound

A sound source, emitting sound of constant frequency, moves with a...

A sound source, emitting sound of constant frequency, moves with a constant speed and crosses a stationary observer. The frequency (n) of sound heard by the observer is plotted against time (t). Which of the following graphs represents the correct variation?A sound source, emitting sound of constant frequency, moves with a constant speed and crosses a stationary observer.A sound source, emitting sound of constant frequency, moves with a constant speed and crosses a stationary observer.A sound source, emitting sound of constant frequency, moves with a constant speed and crosses a stationary observer.A sound source, emitting sound of constant frequency, moves with a constant speed and crosses a stationary observer.

Options

  1. AIn the presence of what substances does enzymatic activity increase?
  2. BIn the presence of what substances does enzymatic activity increase?
  3. CIn the presence of what substances does enzymatic activity increase?
  4. DIn the presence of what substances does enzymatic activity increase?

Correct answer

D. In the presence of what substances does enzymatic activity increase?

Step-by-step solution

(→ source Vs Observer velocity =0)(when Approaching =n\xrightarrow[\text{ source }]{V_s} \text{ Observer velocity }=0)(\text{when Approaching }={ }^n\left[\frac{v}{V-V_s}\right])when Its going away (={ }^n\left[\frac{V}{V+V_s}\right])
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