Question

Write 'true' or 'false' for the following
statements :
1. Sound travels fastest in metals.
2. A material medium is not necessary for the
propagation of sound
3. Red Indians can find out whether an enemy
is approaching their camp by putting their
ear to the ground.
4- The speed of sound can be calculated if we know the distance between the source and observer and the temperature of air.
5- We cannot hear on moon, because their is no gas to propagate sound. ​

Answer 1

the first statement is true

Answer 2

Answer:

2 false

5 true

1 true

3 I think it's true