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
उत्तर
Depth of sea can be measured using ultrasonic waves.
(c) 50 kHz.
APPEARS IN
संबंधित प्रश्न
What is meant by an echo?
On which day, a hot day or a cold day, an echo is heard sooner ? Give reason for your answer.
In which medium, air or water, an echo is heard much sooner ? Why ?
What is the minimum distance in air required from a sound reflecting surface to hear an echo (at 20°C) ?
A man is kidnapped, blindfolded and imprisoned in a big room. How could the man tell if he was in : a furnished room
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.
How can you calculate the speed of sound using echo?
______ allows bats to navigate through dark caves and find insects for food.
______ is an image obtained by the use of reflected ultrasonic waves.
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?
