Question

Why door bell are made up of metal

Answer 1

door bell are made up of metal because metal is very hard and on belling, it creates sound of high frequency.
hope this will help

Answer 2

Hey there!

Door bells are made up of metal because:

<> Metals allow the bell to ring quite pleasant.
<> Metals not decay. If the ring will be of wood it will decay with moisture.
<> Metals produce sound of high frequency as we compare to wood.

Hope it helps you!