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प्रश्न
What is sound? What causes it to produce?
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उत्तर
A sound is a form of energy. It is that external physical cause that affects the ear to produce the sensation. Sound is produced only when some material body is made to vibrate.
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संबंधित प्रश्न
Define time period.
Name the characteristic which differentiates two sounds of the same pitch and same loudness.
Draw a graph between displacement from mean position and time for a body executing free vibrations in vacuum.
What are wavelength, frequency, time period and amplitude of a sound wave?
Name the type of waves produced when a tuning fork is struck in air.
Fig. shows three ways in which a string of length l in an instrument can vibrate.
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| (i) | (ii) | (iii) |
- Which of the diagram shows the principle note?
- Which vibration has the frequency four times that of the first?
- Which vibration is of the longest wavelength?
- What is the ratio of the frequency of the vibration in (i) and (ii)?
For which range of frequencies, human ears are most sensitive?
A cannon is fired at A (see diagram). An observer at B hears two sounds. The first sound is heard after 1 second and the second 3s after the observer sees the flash. (Velocity of sound = 340 ms−1)
(i) Why does the observer see the flash before he hears the sound?
(ii) Calculate the distance x between the observer and the wall.
Draw a displacement-time graph for water wave.
