Advertisements
Advertisements
प्रश्न
How does a bat make use of ultrasonics waves to find its way?
Advertisements
उत्तर
Use of ultrasonics by bats : Bats have no eyes. But they easily move about without colliding with any object (or obstacle). The reason is that they produce ultrasonic sound as they fly. When this ultrasonic sound comes back after reflection from any object (or obstacle) in their way, they hear it and thus they detect the presence of the object (or obstacle).
APPEARS IN
संबंधित प्रश्न
Fill in the blank.
The pitch of a sound depends on its ________.
Fill in the blank.
________ produces a sensation in ears.
Select the correct option:
A part of the longitudinal wave in which particles of the medium are closer than the normal particles is called:
Two tuning forks A and B of frequencies 256 Hz and 192 Hz respectively are vibrated in air. If the wavelength of A is 1.25 m, calculate the wavelength produced by B.
The sound waves are reflected from an obstacle into the same medium from which they were incident. Which of the following changes?
Match the following
| 1. | Infrasonic | (a) | Compressions |
| 2. | Echo | (b) | 22 kHz |
| 3. | Ultrasonic | (c) | 10 Hz |
| 4. | High-pressure region | (d) | Ultrasonography |
What is a longitudinal wave?
______ is an unwanted sound.
Distinguish between compression and rarefactions.
