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NEET 2006
Exam
NEET
Year
2006
Subject
Physics
Chapter
Waves and Sound

NEET 2006 · Physics · Waves and Sound

Two sound waves with wavelengths 5.0 m and 5.5 ~m respectively,...

Two sound waves with wavelengths 5.0 m\mathrm{m} and 5.5 m5.5 \mathrm{~m} respectively, each propagate in a gas with velocity 330 m/s330 \mathrm{~m} / \mathrm{s}. We expect the following number of beats per second:

Options

  1. A6
  2. B12
  3. C0
  4. D1

Correct answer

A. 6

Step-by-step solution

 Frequency = Velocity  Wave length V1=Vλ1=3305=66H2\begin{gathered} \text{ Frequency }=\frac{\text{ Velocity }}{\text{ Wave length }} \\ V_1=\frac{V}{\lambda_1}=\frac{330}{5}=66 \mathrm{H}_2 \end{gathered} and V2=Vλ2=3305⋅5=60V_2=\frac{V}{\lambda_2}=\frac{330}{5 \cdot 5}=60H2\mathrm{H}_2 \thereforeNumberofbeatspersecondNumber of beats per second=V_1-V_2=60-60=6..
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