The audible range of sound for human beings extends from,
50 Hz to 50000 Hz
30 Hz to 30000 Hz
20 Hz to 20000 Hz
40 Hz to 40000 Hz
When the speed of any object exceeds the speed of sound it is said to be traveling at :
Hypersonic speed.
Supersonic speed.
Ultrasonic speed.
Distinguishable speed.
How does the speed of sound change as temperature increases?
Increases
Decreases
Does not change
Unpredictable
The number of complete oscillation per unit time for of a sound wave is:
Wave length
Acceleration
Momentum
Frequency
What causes the rolling of thunder?
Successive reflection of sound
Internal reflection of sound
Single reflection of sound
Distinguished reflection of sound
Sounds of frequencies below 20 Hz are called:
Ultrasonic sound
Supersonic sound
Infrasonic sound
Hypersonic sound
The sound of single frequency is called:
Tone
Note
Timber
None of these
___________ are used to detect cracks and flows in metal blocks.
Super sonic sounds
Ultra sounds
Infra sounds
When a sound producing source moves with a speed higher than that of sound in air, it produces:
Shock waves
Supersonic waves
Ultrasonic waves
Pressure waves
Sound propagates through
Solid
Liquid
Gas
All the above