Beats, Loudness, Pitch and Characteristics of Sound questions with solutions

Showing 1–10 of 38 questions

• NumericmediumWave MotionBeats, Loudness, Pitch and Characteristics of Sound

  A sonometer wire produces 20 beats per second with a 300 Hz tuning fork. The tension in the wire is then increased by 44%, while its vibrating length and linear density remain unchanged, and the beat frequency becomes 36 beats per second. If the original string frequency is N Hz, find N.

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• NumericmediumWave MotionBeats, Loudness, Pitch and Characteristics of Sound

  An unknown tuning fork gives 5 beats per second with a 340 Hz standard fork. After the unknown fork is filed, its frequency increases and the beat frequency falls to 2 beats per second. If the original frequency of the unknown fork is N Hz, find N.

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• NumericmediumWave MotionBeats, Loudness, Pitch and Characteristics of Sound

  An unknown tuning fork gives 6 beats per second with a 384 Hz standard fork. Wax is added to the unknown fork, lowering its frequency, and the beat frequency decreases to 4 beats per second. If its original frequency is N Hz, find N.

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• NumericmediumWave MotionBeats, Loudness, Pitch and Characteristics of Sound

  Three equal-amplitude tones of frequencies 499 Hz, 500 Hz and 501 Hz are started in phase. Their resultant can be written in the form A[1+2cos(2πNt)]cos(2π500t). Find N.

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• MCQmediumWave MotionBeats, Loudness, Pitch and Characteristics of Sound

  An unknown tuning fork produces 5 beats per second with a standard 340 Hz fork. The unknown fork is then slightly filed, which increases its natural frequency, and the beat frequency becomes 2 beats per second. What was the original frequency of the unknown fork?

  Options

  • Option A

    335 Hz

  • Option B

    338 Hz

  • Option C

    342 Hz

  • Option D

    345 Hz

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• MCQmediumWave MotionBeats, Loudness, Pitch and Characteristics of Sound

  Two harmonic waves moving in the same direction superimpose to form x = a cos(1.5t) cos(50.5t), where t is in seconds. Find the beat period, rounded to the nearest integer.

  Options

  • Option A

    6 s

  • Option B

    4 s

  • Option C

    1 s

  • Option D

    2 s

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• MCQmediumWave MotionBeats, Loudness, Pitch and Characteristics of Sound

  A tuning fork is exactly in resonance with the fundamental mode of a sonometer wire when the wire tension is 16 N. The vibrating length and linear density are kept unchanged, and the tension is increased to 36 N. The wire then produces 90 beats per second with the same tuning fork. What is the tuning-fork frequency?

  Options

  • Option A

    120 Hz

  • Option B

    150 Hz

  • Option C

    180 Hz

  • Option D

    270 Hz

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• Multi-correctmediumWave MotionBeats, Loudness, Pitch and Characteristics of Sound

  Which statements correctly describe the perceptual properties of sound?

  Select all that apply

  • Option A

    Pitch is primarily related to frequency.

  • Option B

    Sound-intensity level is commonly expressed in decibels.

  • Option C

    Quality or timbre depends strongly on harmonic content.

  • Option D

    Perceived loudness depends only on intensity and is completely independent of frequency.

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• MCQmediumWave MotionBeats, Loudness, Pitch and Characteristics of Sound

  Two tuning forks A and B initially produce 5 beats per second. Wax is added only to fork B, lowering its frequency by 3 Hz, and the new beat frequency becomes 8 beats per second. Which statement must be true?

  Options

  • Option A

    Fork B was initially 5 Hz below fork A.

  • Option B

    Fork B was initially 5 Hz above fork A.

  • Option C

    The two forks initially had equal frequency.

  • Option D

    The original order of the frequencies cannot be determined.

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• MCQmediumWave MotionBeats, Loudness, Pitch and Characteristics of Sound

  A point-like singing bird emits approximately constant acoustic power while flying directly towards a stationary listener. Neglect absorption of sound. If the measured sound-intensity level rises by 20 dB, what is the bird's new distance from the listener compared with its initial distance?

  Options

  • Option A

    One-half of the initial distance

  • Option B

    One-fourth of the initial distance

  • Option C

    One-tenth of the initial distance

  • Option D

    One-hundredth of the initial distance

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