Question

When a vibrating tuning fork is placed on a table, a loud sound is heard. This is due to

• A. forced vibrations
• B. free vibrations
• C. beats
• D. reflection

Answer 1

The correct option is A

forced vibrations

The explanation for the correct option:

1. When a vibrating tuning fork is placed on a table, then a large sound is heard due to the entire system begins vibrating and forces surrounding air particles into vibration motion.
2. Forced vibration is the tendency of one object to force another adjoining or interconnected object into vibration motion.

The explanation for the incorrect options:

1. When an initial input as a force is given to a system which results in motion of the system as vibration and later this system vibrates freely without the help of any external force can be termed as free vibrations.
2. Beats are the periodic interference of sound waves.
3. Reflection of sound waves that cause repetition of sound from an obstacle is called an echo.

Hence, option (a) is correct.