Name: Study of Infrasound and Ultrasound in Waves
Uploaded: 2019-07-19
Duration: 5 min 55 s
Description: If you pay attention, you will be able to hear so many different sounds in your daily life. What about the sounds that the human ear is not capable of detect...

Question

How sound is produced by the bell at your school? Observe and explain.

Accepted Answer

A simple electric bell consists of an electromagnet, an armature, a contact adjusting screw, a gong, and a hammer. The armature consists of a soft iron mounted on a spring. One end of the iron rod presses against the top of the contact adjusting screw.

When the switch is pressed on, the current flows in the electromagnet. It then attracts the iron rod towards itself, causing the hammer to strike the gong. At the same time, the armature loses contact with the screw and the current is switched off. This causes the electromagnet to lose its magnetism and the armature springs back to its original position to close the circuit once again. The current flows again and the cycle repeats itself till the current is switched off. This leads to the vibration of the gong rapidly, which in turn produces a very high pitch sound.

Manipur Board Solutions for Chapter: Waves and Sound, Exercise 1: Try to answer:

Manipur Board Science Solutions for Exercise - Manipur Board Solutions for Chapter: Waves and Sound, Exercise 1: Try to answer:

Questions from Manipur Board Solutions for Chapter: Waves and Sound, Exercise 1: Try to answer: with Hints & Solutions

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