Question

State whether the given statement is True or false.
The motion described by wire of sitar is a vibratory motion.
A. True
B. False

Answer 1

Hint: When a body is in a vibratory motion, it vibrates about a mean position. This is because a restoring force acts on the body. A restoring force is a force that acts on the body in the opposite direction of the direction of the displacement.

Complete answer:
Let us first understand what a vibrating motion means and when objects can undergo vibration.
Vibration or vibration motion of a body is the to and fro motion of the body. It is a periodic motion. This means it that the motion of the body repeats itself after every equal interval of time.
Some examples of vibrating motion are oscillations of a simple pendulum, the motion of a swing, the motion of a spring and the motion of the membrane of a drum when we hit it with a stick.
Let us understand when a body undergoes a vibratory motion.
When a body is in a vibratory motion, it vibrates about a mean position. This is because a restoring force acts on the body. A restoring force is a force that acts on the body in the opposite direction of the direction of the displacement.
The two ends of a wire of a sitar are fixed. Therefore, when we disturb that wire, it feels a restoring force and it vibrates about its mean position.
Therefore, the motion described by wire of sitar is a vibratory motion.
This means that the given statement is true.

Hence, the correct option is A.

Note:
In bodies like wires, strings and springs, the restoring force is an internal force. This restoring force depends on the elasticity of the body. That is why rigid bodies do not vibrate because they have zero elasticity.