Advertisements
Advertisements
प्रश्न
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 ?
विकल्प
15,000 Hz
10 kHz
50 kHz
10,000 Hz
Advertisements
उत्तर
Depth of sea can be measured using ultrasonic waves.
(c) 50 kHz.
संबंधित प्रश्न
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?
The minimum distance between the source and the reflector in air. So that an echo is heard is approximately equal to ______.
Explain why, the flash of lightning reaches us first and the sound of thunder is heard a little later.
Which of the following statement best describes frequency?
Fill in the blank with suitable word :
An echo is simply a ................... sound.
Why do we hear more clearly in a room with curtains than in a room without curtains ?
What is the minimum distance in air required from a sound reflecting surface to hear an echo (at 20°C) ?
Answer the following question in your own words.
What should be the dimensions and the shape of classrooms so that no echo can be produced there?
What is the minimum distance needed for an echo?
A man is standing between two vertical walls 680 m apart. He claps his hands and hears two distinct echoes after 0.9 seconds and 1.1 seconds respectively. What is the speed of sound in the air?
What is an echo?
What are the medical applications of echo?
Assertion: The sound which we hear again is called Echo.
Reason: The sensation of sound (Echo) persists in our brain for about 1 s.
What is an echo? Write the conditions to hear an echo.
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?
Answer the following question in your own words.
What factors are important to get a distinct echo?
Rohan conducted experiments on echo in different media. He observed that a minimum distance of 'x' meters is required for the echo to be heard in oxygen and 'y' meters in benzene. Compare 'x' and 'y'. Justify your answer.
Speed of sound in oxygen: 340 ms-1
Speed of sound in benzene: 200 ms-1
