Advertisements
Advertisements
Question
What is the other name of a loud-hailer ?
Advertisements
Solution
Megaphone or bullhorn is also called as loudhailer.
APPEARS IN
RELATED QUESTIONS
What is meant by an echo?
Which of the following statement best describes frequency?
Which property of sound leads of the formation of echoes ?
Why are the ceilings of concert halls made curved ? Draw a labelled diagram to illustrate your answer.
Name any two objects which are good reflectors of sound.
What is the minimum distance in air required from a sound reflecting surface to hear an echo (at 20°C) ?
A man standing 825 metres away from a cliff (steep rock) fires a gun. After how long will he hear its echo ? Speed of sound in air is 330 m/s.
The frequencies of four sound waves are given below. Which of these sound waves can be used to measure the depth of sea by the echo method ?
When sound is reflected from a distant object, an echo is produced. Let the distance between the reflecting surface and the source of sound remain the same. Do you hear an echo sound on a hotter day? Justify your answer.
Numerical problems:
An echo returned in 3s. What is the distance of the reflecting surface from the source given that the speed of sound is 330 ms-1?
