Advertisements
Advertisements
प्रश्न
Sound can travel through solids, gases, liquids, and even vacuum.
विकल्प
True
False
Advertisements
उत्तर
Sound can travel through solids, gases, liquids, and even vacuum - false.
Reason:
Sound can not travel in a vacuum. This is because sound waves are vibrating waves. In a vacuum, where there are no atoms or molecules to vibrate.
APPEARS IN
संबंधित प्रश्न
You recognize your friend by hearing his voice on a telephone. Explain.
What causes sound?
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.
A thin metal plate is placed against the teeth of cog wheel. Cog wheel is rotated at a speed of 120 rotations per minute and has 160 teeth. Calculate:
- frequency of node produced.
- speed of sound, if wavelength is 1.05 m.
- what will be the effect when the speed of cog wheel is doubled?
A musical instrument is producing continuous note. This note cannot be heard by a person having a normal hearing range. This note must then be passing through ______.
Name three animals which can hear ultrasonic vibrations.
Why is the ceiling and wall behind the stage of good conference halls or concert halls made curved?
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 ______.
