Question

S
5. An observer puts ear on a railway ling
500 m from a friend with a hammer. When
his friend hits the railway line with the
hammer, the observer hears two sounds
The sound is first heard through
(a) railway line
(b) air
(c) at the same time through railway line
and air
(d) no sound is heard​

Answer 1

Explanation:

air and railway line are the answers

Answer 2

Explanation:

As tracks are solid therefore sound travels faster through tracks than through air and person can hear an approaching train