Advertisements
Advertisements
प्रश्न
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.
उत्तर
(i) We have,
Wave velocity = Frequency × Wavelength
24 ms−1 = n × (20 × 10−2 m)
or n = `24/(24xx10^-2)` = 120 per second.
(ii) Time period = `1/"Frequency"=(1/120)"sec."` = 0.00833 sec.
The approximate frequency range of sound waves is about 15 to 200,000 Hz.
APPEARS IN
संबंधित प्रश्न
The human ear can detect continuous sounds in the frequency range from 20 Hz to 20,000 Hz. Assuming that the speed of sound in air is 330 ms1 for all frequencies; calculate the wavelengths corresponding to the given extreme frequencies of the audible range
How is the frequency of a stretched string related it’s tension?
Define wave velocity term in relation to a wave.
What is a bulb horn ? Name the principle on which a bulb horn works.
Explain how the principle of echo is used by
The bat during its flight at
What are infrasonic waves?
Point out the waves from the given list, i.e., light, sound, radio waves, ultrasonic waves, and thermal radiation, the energy is propagated by mechanical waves.
Why will an echo not be heard when the distance between the source of the sound and the reflecting surface is 10 m?
When a sound is made from a distance of 18 m, in front of a tall building, it is found to get repeated again. Which phenomenon is associated with this observation? Give a brief explanation of this phenomenon?
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.
