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Give one reason for Ultrasonic waves use for echo depth sounding purpose.
What is meant by the natural frequency of vibration of a body?
On What factors does the natural frequency of vibration of a body depend?
State one condition for a body to execute free/natural vibrations.
State one way of increasing the frequency of a note produced by an air column.
State two ways of increasing the frequency of vibrations of a stretched string.
Explain why strings of different thicknesses are provided on a stringed instrument.
[Hint: Natural frequency of vibration of a stretched string is inversely proportional to the radius (or thickness) of string so notes of different frequencies can be produces by vibrating different strings.]
Explain why does a wine glass starts rattling, when a note of some particular frequency is struck by a piano?
Where can a body execute natural vibrations?
