Advertisements
Advertisements
प्रश्न
What are infrasonic waves?
Advertisements
उत्तर
The waves of frequency below 20 Hz are called infrasonic waves.
संबंधित प्रश्न
How is the frequency of a stretched string related it’s tension?
State two factors on which the speed of a wave travelling in a medium depends.
Name the principle on which a soundboard works.
What is a megaphone ? Name the principle on which a megaphone works.
Draw a labelled diagram to show the multiple reflections of sound in a part of the stethoscope tube.
Explain how the principle of echo is used by
The dolphin to locate small fish as its prey
What do you mean by reflection of sound? State one condition for the reflection of a sound wave. Name a device in which reflection of sound wave is used.
What do you understand by the ‘Echolocation system of Dolphins’?
Draw a diagram representing a wave of amplitude 4 cm and wavelength 2 m. If the frequency of the wave is 150 Hz, calculate its velocity.
Waves produced on the surface of the water are formed to move with a velocity of 24 ms−1. If the wavelength of these waves equals 20 cm. find the
(i) frequency (no. of waves produced per second)
(ii) the time period (i.e. the time required to produce one wave) for these waves.
