Advertisements
Advertisements
प्रश्न
What is echolocation? How do animals make use of this phenomenon?
उत्तर
Echolocation is defined as sending out sounds to judge the location, size, and motion of objects from the returning echoes. The animals use this phenomenon to locate the obstacles in their path and avoid them so it helps them in navigation and to locate their prey.
APPEARS IN
संबंधित प्रश्न
Write true or false for a given statement.
Female voice is shriller than the male voice.
Fig. shows three ways in which a string of length l in an instrument can vibrate.
![]() |
![]() |
![]() |
(i) | (ii) | (iii) |
- Which of the diagram shows the principle note?
- Which vibration has the frequency four times that of the first?
- Which vibration is of the longest wavelength?
- What is the ratio of the frequency of the vibration in (i) and (ii)?
Draw a displacement-distance graph of a wave and mark on it, the amplitude of wave by the letter 'a' and wavelength of wave by the letter λ.
Complete the following sentences :
Sound cannot travel through __________, but it requires a ___________.
A cannon is fired at A (see diagram). An observer at B hears two sounds. The first sound is heard after 1 second and the second 3s after the observer sees the flash. (Velocity of sound = 340 ms−1)
(i) Why does the observer see the flash before he hears the sound?
(ii) Calculate the distance x between the observer and the wall.
Name the factors on which the speed of sound depends.
A person hearing at one end of a long metal bar hears two distinct sounds when the other end is struck with a stone. Explain, giving scientific reasons
Sound travels in air:
How does the sound produced by a vibrating object in a medium reach your ears?
Two sound waves X and Y have the same amplitude and the same wave pattern but their frequencies are 60 Hz and 120 Hz respectively, then ______.