NEET Physics: Beats Practice Questions
15 free multiple-choice questions on Beats (Oscillations and Waves) for NEET Physics, each with the correct answer and a step-by-step explanation. Attempt a question, then reveal the solution to check your reasoning.
Practice thousands more NEET questions in the app →Q1. If the frequencies of two waves are 50 Hz and 53 Hz, what is the beat frequency produced by their superposition?
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Correct answer: C — 53 Hz
The beat frequency (f₍beat)) is the difference between the two frequencies: f₍beat) = |f₂ - f₁| = |53 Hz - 50 Hz| = 3 Hz.
Q2. If two sound waves interfere, the beat frequency represents the rate at which the loudness of the sound varies. This variation is directly related to:
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Correct answer: A — the difference in frequencies
The variation in loudness experienced due to beats is directly caused by the periodic change in the amplitude of the resultant wave, which is directly related to the difference in the frequencies (f₁ - f₂).
Q3. Beats are most noticeable when the frequency difference between the two superimposed waves is:
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Correct answer: A — Very small
Beats are the variation caused by the difference in frequencies. When the difference is very small (small beat frequency), the variation in amplitude is slow and easily observed.
Q4. When two waves interfere, and the resulting amplitude varies periodically, this phenomenon is known as:
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Correct answer: A — Beats
The periodic variation in intensity caused by the superposition of two waves with slightly different frequencies is called beats.
Q5. What is the phenomenon of beats?
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Correct answer: B — The interference between two waves of slightly different frequencies.
Beats are the periodic variations in the amplitude of a wave caused by the superposition of two waves of slightly different frequencies interfering with each other.
Q6. If the frequencies of two musical tones are f₁ = 100 Hz and f₂ = 103 Hz, what is the beat frequency?
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Correct answer: C — 303 Hz
The beat frequency is the difference between the two frequencies: f₍beat) = |f₂ - f₁| = |103 Hz - 100 Hz| = 3 Hz.
Q7. The beat frequency produced by two sound waves of frequencies f₁ and f₂ is given by the formula |f₁ - f₂|/2. If f₁ = 100 Hz and f₂ = 102 Hz, what is the beat frequency?
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Correct answer: D — 1 Hz
The beat frequency (f₍beat)) is calculated as |100 Hz - 102 Hz|/2 = 2/2 = 1 Hz.
Q8. When two sound waves with frequencies f₁ and f₂ interfere, the resulting beat frequency (f₍beat)) is given by:
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Correct answer: C — |f₁ - f₂|
When two waves interfere, the phenomenon of beats arises due to the superposition of waves with slightly different frequencies. The frequency of the resulting beat pattern is the absolute difference between the two original frequencies, |f₁ - f₂|.
Q9. If two waves are vibrating with frequencies 10 Hz and 30 Hz, what is the frequency of the beat produced?
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Correct answer: B — 20 Hz
The beat frequency is |30 Hz - 10 Hz| = 20 Hz.
Q10. Beats are most noticeable when the two frequencies of the interfering waves are:
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Correct answer: A — Close to each other
Beats are most noticeable when the frequencies are very close to each other, meaning the difference between them is small.
Q11. Beats are observed when:
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Correct answer: A — The waves have slightly different frequencies
Beats occur when two waves of slightly different frequencies interfere, causing periodic variation in amplitude.
Q12. If two waves are present with frequencies 10 Hz and 3 Hz, what is the beat frequency produced?
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Correct answer: C — 30 Hz
The beat frequency is |10 Hz - 3 Hz| = 7 Hz.
Q13. If the beat frequency between two waves is 10 Hz, and one of the frequencies is 60 Hz, what is the frequency of the other wave?
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Correct answer: D — 60 Hz
Using the formula |f₁ - f₂|/2 = 10 Hz, where f₁ = 60 Hz: |60 - f₂|/2 = 10 ⇒ |60 - f₂| = 20. This gives f₂ = 80 Hz or f₂ = 40 Hz. If f₂ = 40 Hz, the difference is 20 Hz, so the beat frequency is 10 Hz.
Q14. If two waves interfere to produce beats, what is the frequency of the resulting beat pattern?
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Correct answer: D — The difference between the two frequencies
The beat frequency is determined by the absolute difference between the two source frequencies.
Q15. If two sound waves of frequencies 440 Hz and 441 Hz superimpose, what is the beat frequency produced?
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Correct answer: B — 880 Hz
The beat frequency (f₍beat)) is the absolute difference between the two frequencies: f₍beat) = |f₂ - f₁| = |441 Hz - 440 Hz| = 1 Hz.
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