The frequency of a source is 20 kHz. The frequencies of sound wave produced by it in water and air will be
Same as that of source = 20 kHz
> 20 kHz
< 20 kHz
Depends upon velocity
To and fro motion of a particle about its mean position is called
Frequency
Amplitude
Wavelength
Vibration
The pleasing sounds are called
Music.
Noise.
loudness.
None of these.
The range of audible frequencies is
20 to 20,000Hz
less than 20 Hz
higher than 20,000 Hz
none of these.
The loudness of sound depends on :
Phase
Harmonics
Loudness of sound is directly proportional to the
Amplitude of wave
Distance from the source of sound
Frequency of the wave
Wavelength of the wave
Ultrasound can be detected by
Bat
Elephant
Lions
Sheep
The eardrum is like
Stretched rubber sheet.
Stretched string.
Air column.
Sound can be produced by use of which of the following objects?
Expanding objects
Opaque objects
Hot objects
Vibrating objects
What is the loudness of Normal Conversation?
10 dB.
30 dB.
60 db.