Question

2.
sound?
(b) Describe so
3. Describe how
from the souro
medium
4. Describe an e
(a) very loud
(c) weak sound
1. An electric bell is suspended in a bell jar and
then air is removed from it. On switching on
(d) no sound is heard
2. The convenient instrument used in laboratory
3. The crack of a thunder cloud is heard later
D. Tick (m) the most appropriate answer
the electric bell, the sound heard is:
(b) normal sound
to produce pure sound is :
(a) whistle
(b) drum
(c) tuning fork
(d) guitar
than the flash of lightning because, the light
travels :
SOME COMM
Amplitude,
three important
Amplitude
body from its
is metre (m)
(a) much slower than sound
(b) much faster than sound
(c) at the same speed as sound
(d) none of these
4. The approximate speed of sound in air at
room temperature is :
(a) 33.2 ms-1
(b) 3320 ms -1
(c) 3.32 ms-1
(d) 332 ms-1
In figure
Frequeno
in one secon
Its SI U
Heinrich R.
second, its f
Time
complete
SI unit is
5. An observer puts ear on a railway line
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

Answer:

a.very loud

sorry i don't understand that one only i can understand