The frequencies of four sound waves are given below. Which of these sound waves can be used to measure the depth of sea?
15,000 Hz
100 kHz
50 kHz
10,000 Hz
A key of mechanical piano is first struck gently and then struck again but much harder this time. In the second case:
Sound will be louder but pitch will not be different
Sound will be louder and the ptich will also be higher
Sound will be louder but pitch will be lower
Both loudness and pitch will remain unaffected
Voice of which of following is likely to have minimum frequency?
Baby girl
Baby boy
A man
A woman
The maximum speed of vibrations which produce audible sound will be in:
dry air
sea water
ground glass
human blood
Which of the following sound frequencies can be heard by a woman having a normal hearing range?
A. 25000 Hz
B. 15 KHz
C. 4000 Hz
D. 25 Hz
A and B
B and C
B and D
only D
The velocities of sound waves in four media P, Q, R and S are 18,000 km/h, 900 km/h, 0 km/h, and 1200 km/h respectively. Which medium could be a liquid substance?
P
Q
R
S
To an fro motion of an object is called
Waves
Amplitude
Vibration
All of the above
Which of the following vibrates when a musical note is produced by the cymbals in an orchestra?
Stretched strings
Stretched membranes
Metal plates
Air columns
Noise pollution is harmful for
Human
Cat
Bird
All
Sound is a kind of
Work
Energy
Force
None
