Amplitude
Trending Questions
The SI unit of loudness is bel, but it is measured in decibel.
- True
- False
How does the wave pattern of a loud note differ from a soft note ? Draw a diagram.
Observe the diagram given below and answer the questions
- Which wave has the maximum loudness?
- Name the wave that has the highest pitch.
Transverse waves as well as longitudinal waves can travel through any medium, a solid or a liquid or a gas.
- True
- False
Fig. 7.27 shows the wave patterns of three sounds A, B and C. Name the characteristic of sound which is same between (i) A and B, (ii) B and C, and (iii) C and A.
Discuss the propagation of sound as a longitudinal wave.
- 4
- 2
- 8
- 16
What happens when prongs of a tuning fork vibrate to and fro about their mean positions?
In the phenomenon of propagation of sound in air:
Temperature remains constant
Heat remains constant
Pressure remains contant
Both A and B
During propagation of sound through air, there is no change in pressure but there is fluctuation of density.
- True
- False
- 0.02 s
- 0.2 s
- 0.05 s
- 0.5 s
Speed of sound in air is around
1440 m/s
300 m/s
340 m/s
430 m/s
What are the characteristics same for both waves given in the fig (1) and fig (2).
Same: Loudness and Different: Pitch
Same: Quality and Different: Pitch
Same: Loudness as well as Pitch and Different: Intensity
Same: Loudness as well as Pitch and Different: Quality
Explain the following term-
- Wavelength
- Pitch
- Compression
- Rarefaction
- Longitudinal wave.
- Decibel.
- Noise pollution.
- Velocity
- Frequency
- Amplitude
- Wavelength
A vibrating tuning fork is placed over the mouth of a burette filled with water. The tap of the burette is opened and the water level gradually starts falling. it is found that the sound from the tuning fork Becomes very loud for a particular length of the water column.
Why does the sound become very loud for this length of the water column?
Two waves of the same pitch have their amplitudes in the ratio 2:3.
The ratio of their loudness will be:
2:3
4:9
3:2
9:4
Loudness depends on the frequency
- True
- False
- Frequency
- Amplitude
- Wavelength
If the intensities of two sounds are in ratio 9:4, what is the ratio of their amplitude?
3:2
2:3
81:16
16:81
When we change feeble sound to loud we increase its
frequency
amplitude
velocity
wavelength
In the following questions, a statement of assertion followed by the reason is given. Choose the correct answers out of the following choices:
Assertion: Sound wave represents only density change when it moves in a medium.
Reason: Only the density of the medium at a given time varies with distance.
Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.
The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.
Assertion is true but the Reason is false.
The statement of the Assertion is false but the Reason is true.
Both the statements are false.
Explain why loudness of the sound note varies with distance from the source of sound.
- Loudness
- Pitch
- Single frequency
- Multiple frequencies
Decibel (dB) is a unit of loudness of sound. It is defined in a manner such that when the amplitude of the sound is multiplied by a factor of √10, the decibel level increases by 10 units. Loud music of 70 dB is being played at a function. To reduce the loudness to a level of 30 dB, the amplitude of the instrument playing music has to be reduced by a factor of:
10
10√10
100
100√100
- filter
- rectifier
- FET
- oscillator