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51.	State two factors on which natural frequency of a body depends.
Answer» (i) The shape of the body, and (ii) The size of the body.

Discussion

52.	State three factors on which the frequency of vibration of a stretched string depends.
Answer» (i) Length of the stretched string, (ii) Tension in the string, (iii) Mass per unit length of the string.

Discussion

53.	What do you understand by the damped vibration? Give one example.
Answer» The periodic vibrations of a body of amplitude decreasing with time, due to the presence of medium, are called damped vibrations. Example: The vibrations of a simple pendulum in air. The displacement—time graph showing damped vibration is given in figure.

53.

What do you understand by the damped vibration? Give one example.

Answer»

The periodic vibrations of a body of amplitude decreasing with time, due to the presence of medium, are called damped vibrations.

Example: The vibrations of a simple pendulum in air. The displacement—time graph showing damped vibration is given in figure.

Discussion

54.	Point out the waves from the given list, i.e., light, sound, radio waves, ultrasonic waves and thermal radiation, the energy is propagated by mechanical waves.
Answer» The energy, in sound and ultrasonic waves, is propagated by mechanical waves.

Discussion

55.	Write the approximate value of speed of sound in (i) air, (ii) water, and (iii) iron.
Answer» (i) The speed of sound in air = 340ms^-1 (ii) The speed of sound in water = 1500ms^-1 (iii) The speed of sound in iron = 5100ms^-1.

Discussion

56.	Two astronauts cannot hear each other on the moon. Why?
Answer» Material medium is necessary for the propagation of sound. On the moon there is vacuum, i.e. no air, therefore sound cannot propagate on the moon. Thus the astronauts can not hear each other.

Discussion

Explore topic-wise InterviewSolutions in .

State two factors on which natural frequency of a body depends.

State three factors on which the frequency of vibration of a stretched string depends.

What do you understand by the damped vibration? Give one example.

Point out the waves from the given list, i.e., light, sound, radio waves, ultrasonic waves and thermal radiation, the energy is propagated by mechanical waves.

Write the approximate value of speed of sound in (i) air, (ii) water, and (iii) iron.

Two astronauts cannot hear each other on the moon. Why?