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प्रश्न
Give scientific reason for the following:
When a nail is hammering appears to get higher and higher in pitch.
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उत्तर
When a nail is hammered into a piece of wood, its length outside wood gradually decreases. As the length decreases, the frequency of vibrations increases and hence the pitch being directly proportional to the frequency also increases
संबंधित प्रश्न
A pendulum oscillates 40 times in 4 seconds. Find its time period and frequency.
State two conditions for an echo to take place.
Explain the mechanism of the formation of a longitudinal wave when the source vibrates in the air.
Obtain relationship between the time period and frequency.
State three factors on which loudness of sound heard by a listener depends.
Two musical notes of the same pitch and same loudness are played on two different instruments. Their wave patterns are as shown in figure.
How do they differ in
(a) loudness,
(b) pitch and
(c) quality
Two waves of the same pitch have amplitudes in the ratio 1:3. What will be the ratio of loudness?
Two waves of the same pitch have amplitudes in the ratio 1 : 3. What will be the ratio of their:
- intensities and
- frequencies
When a gun is fired at a distance, why is it that the flash is seen almost instantaneously while the sound is heard a little later?
Give a scientific reason.
We can hear the movement of a mosquito’s wings but we cannot hear the movement of our hands.
