Advertisements
Advertisements
Question
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 ?
Options
15,000 Hz
10 kHz
50 kHz
10,000 Hz
Advertisements
Solution
Depth of sea can be measured using ultrasonic waves.
(c) 50 kHz.
APPEARS IN
RELATED QUESTIONS
When a sound is reflected from a distant object, an echo is produced. Let the distance between the reflecting surface and the source of sound production remains the same. Do you hear echo sound on a hotter day?
A man is standing at a distance of 12 m from a cliff. Will he be able to hear a clear echo of his sound? Give a reason for your answer.
What is the other name of a loud-hailer ?
In which medium, air or water, an echo is heard much sooner ? Why ?
What is meant by 'reflection of sound' ? What type of surfaces are the best for reflecting sound ?
What is an echo ? How is echo formed ?
What is the minimum distance in air required from a sound reflecting surface to hear an echo (at 20°C) ?
Which of the following device does not work on the multiple reflections of sound waves ?
Answer the following question in your own words.
Study the construction of the Golghumat at Vijapur and discuss the reasons for the multiple echoes produced there.
Assertion: The sound which we hear again is called Echo.
Reason: The sensation of sound (Echo) persists in our brain for about 1 s.
