Frequency
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Sound waves have the following frequencies that are audible to human beings
[CPMT 1975]
5 c/s
27000 c/s
5000 c/s
50, 000 c/s
The superposing waves are represented by the following equations :
y1=5 sin 2π(10t−0.1x), y2=10 sin 2π(20t−0.2x)
Ratio of intensities ImaxImin will be
[AIIMS 1995; KCET 2001]
16
1
9
4
An empty vessel is partially filled with water, then the frequency of vibration of air column in the vessel
Increases
Remains same
Decreases
First increases then decreases
The relation between frequency 'n' wavelength 'λ' and velocity of
propagation 'v' of wave is[EAMCET 1979; CPMT 1976, 85]
n = n
n =
n =
4 rad/s
3 rad/s
2 rad/s
1 rad/s
[Take speed of sound =330 m/s]
- 329 Hz
- 629 Hz
- 429 Hz
- 529 Hz
Two tuning forks when sounded together produced a beat with frequency of 4 Hz. The frequency of one fork is 256 Hz. The number of beats heard increases when the fork of frequency 256 Hz is loaded with wax. The frequency of the other fork is,
260
520
504
252
- 360 m/s
- 330 m/s
- 337 m/s
- 300 m/s
- 120π cm/s
- −160π cm/s
- −80π cm/s
- 40π cm/s
- 1200 Hz
- 192 Hz
- 2400 Hz
- 96 Hz