To and fro motion of a particle about its mean position is called
Frequency
Amplitude
Wavelength
Vibration
The to and fro motion of an object is termed as :
vibration.
oscillation.
Modulation.
feedback
Two main properties of sound is :
Frequency and amplitude.
Amplitude and phase.
Frequency and phase.
None of these.
Sound levels are measured in
Decimetres
Decibels
Decilitres
Decigrams
Animals can hear sound of frequencies :
higher than 20,000 Hz
less than 20 Hz
higher than 20 Hz
none of these.
Which of the following are stretched across the voice box?
larynx.
vocal chords.
windpipe.
Quality of sound is used to distinguish between
Noise and Music
Two different vibrating bodies
Two notes produced by same vibrating body
All of the above
The number of oscillations per second is called
Frequency.
Amplitude.
Phase.
Mohan fires a gun 150 m from a cliff. His friend Sohan who is standing 300 m further away from the cliff hears the gun 1 second after he sees the flash.
Sohan will hear the echo from the cliff
1 second after seeing the flash
2 seconds after hearing the gun
2 seconds after seeing the flash
4 seconds after hearing the gun
The pleasing sounds are called
Music.
Noise.
loudness.