Question

3
(b) normal sound
D. Tick (/) the most appropriate answer:
1. An electric bell is suspended in a belljar and
then air is removed from it. On switching on
the electric bell, the sound heard is:
(d) no sound is heard
2. The convenient instrument used in laboratory
(a) very loud
(c) weak sound
to produce pure sound is :
(a) whistle
(c) tuning fork
3. The crack of a thunder cloud is heard later
than the flash of lightning because, the light
travels :
(a) much slower than sound
(b) much faster than sound
(c) at the same speed as sound
(d) none of these
(b) drum
(d) guitar
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
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:

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Answer 2

Answer:

Here are your answers -

1) No sound is heard (Because sound doesn't travel in vacuum)

2) Tuning fork (This is the instrument used in laboratories)

3) Much faster than sound (Because light speed is greater than sound's speed)

4) 332 ms-1

5) railway line (Because sound travels faster in solids than in liquids)

Explanation: