Question 1:
State four sources of vibration that produce sound.
Answer:
Vibration of insect wings, vibration of plucked guitar strings, vibration of air in a trumpet and a pipe, vibration of a voice box.
(Any other answers are accepted)
State four sources of vibration that produce sound.
Answer:
Vibration of insect wings, vibration of plucked guitar strings, vibration of air in a trumpet and a pipe, vibration of a voice box.
(Any other answers are accepted)
Question 2:
Tick (√) the correct statement regarding sound waves.
(a) Sound waves can only be reflected. [ ]
(b) Astronauts can hear sounds more clearly in the space than on Earth. [ ]
(c) Sound waves require a medium to propagate. [ ]
Answer:
(c)
Tick (√) the correct statement regarding sound waves.
(a) Sound waves can only be reflected. [ ]
(b) Astronauts can hear sounds more clearly in the space than on Earth. [ ]
(c) Sound waves require a medium to propagate. [ ]
Answer:
(c)
Question 3:
The walls of cinema halls are usually covered with layers of thin softboards. What is the purpose of these boards?
Answer:
They absorb and prevent reflection of sound.
The walls of cinema halls are usually covered with layers of thin softboards. What is the purpose of these boards?
Answer:
They absorb and prevent reflection of sound.