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NEET
Exam
NEET
Subject
Physics
Chapter
Waves and Sound

NEET · Physics · Waves and Sound

A parallel beam of light is incident on a tank filled with water up...

A parallel beam of light is incident on a tank filled with water up to a height of 61.5 mm61.5 \mathrm{~mm} as shown in the figure below. Ultrasonic waves of frequency 0.5MHz0.5 \mathrm{MHz} are sent along the length of the water column using a transducer placed at the top, and they form longitudinal standing waves in the water. Which of the schematic plots below best describes the intensity distribution of the light as seen on the screen? Take the speed of sound in water to be 1,500 m/s.1,500 \mathrm{~m} / \mathrm{s} . A parallel beam of light is incident on a tank filled with water up to a height of 61.5 ~mm as shown in the figure

Options

  1. AWhat is the estimated total number of air molecules (inclusive of oxygen, nitrogen, water vapor, and other
  2. BWhat is the estimated total number of air molecules (inclusive of oxygen, nitrogen, water vapor, and other
  3. CWhat is the estimated total number of air molecules (inclusive of oxygen, nitrogen, water vapor, and other
  4. DWhat is the estimated total number of air molecules (inclusive of oxygen, nitrogen, water vapor, and other

Correct answer

A. What is the estimated total number of air molecules (inclusive of oxygen, nitrogen, water vapor, and other

Step-by-step solution

v=vλ\mathrm{v}=v \lambda ⇒λ=15000.5×106=3000×10−6\Rightarrow \lambda=\frac{1500}{0.5 \times 10^{6}}=3000 \times 10^{-6} λ=3 mm\lambda=3 \mathrm{~mm} A parallel beam of light is incident on a tank filled with water up to a height of 61.5 ~mm as shown in the figure
intensity vary according to graph ' A\mathrm{A} '
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