Waves

Waves

Moderate Questions
Difficult Questions

Physics of Sound

Oscillations
Waves
  1. A tuning fork of frequency 512 Hz makes 4 beats per second with the vibrating string of a piano. The beat frequency decreases to 2 beats per sec when the tension in the piano string is slightly increased. The frequency of the piano string before increasing the tension was








  1. View Hint View Answer Discuss in Forum

    The frequency of the piano string = 512 ± 4 = 516 or 508. When the tension is increased, beat frequency decreases to 2, it means that frequency of the string is 508 as frequency of string increases with tension.

    Correct Option: D

    The frequency of the piano string = 512 ± 4 = 516 or 508. When the tension is increased, beat frequency decreases to 2, it means that frequency of the string is 508 as frequency of string increases with tension.

  1. Two sound waves with wavelengths 5.0 m and 5.5m respectively, each propagate in a gas with velocity 330 m/s. We expect the following number of beats per second








  1. View Hint View Answer Discuss in Forum

    Frequencies of sound waves are

    330
    		 &
    330
    55.5

    i.e., 66 Hz and 60 Hz
    Frequencies of beat = 66 – 60 = 6 per second

    Correct Option: C

    Frequencies of sound waves are

    330
    		 &
    330
    55.5

    i.e., 66 Hz and 60 Hz
    Frequencies of beat = 66 – 60 = 6 per second