Advertisements
Advertisements
प्रश्न
Solve the following problem.
A certain sound wave in air has a speed 340 m/s and wavelength 1.7 m for this wave, calculate
- the frequency
- the period
Advertisements
उत्तर
Given: v = 340 m/s, λ = 1.7 m
To find: frequency (n), period (T)
Formulae:
- n = `"v"/lambda`
- T = `1/"n"`
Calculation: From formula (i),
n = `340/1.7`
∴ n = 200 Hz
From formula (ii),
T = `1/200 = 1/(2 xx 10^2)`
= 5 × 10-3 ....(using reciprocal table)
∴ T = 0.005 s
The frequency of the sound wave is 200 Hz and its period is 0.005 s.
APPEARS IN
संबंधित प्रश्न
Answer briefly.
Define amplitude.
Define the relation between velocity, wavelength, and frequency of the wave.
Answer briefly.
Explain what is meant by phase of a wave.
Define progressive wave.
State any four properties of progressive wave.
Two waves of the same amplitude superimpose to produce two beats per second. What is the ratio of minimum loudness to that of one of the waves?
The ratio of minimum to maximum wavelength in Balmer series is ____________.
The wave of the wavelength 30 cm and frequency 100 Hz will be ______.
When the kinetic energy of an electron is increased, the wavelength of the associated wave will ______.
If velocity of sound in a gas is 360 m/s and the distance between a compression and the nearest rarefaction is 2 m, then the frequency of sound is ____________.
The frequency of a tuning fork is 220 Hz and the velocity of sound in air is 330 m/s. When the tuning fork completes 80 vibrations, the distance travelled by the ______.
When the observer moves towards a stationary source with velocity V1, the apparent frequency of emitted note is F1. When observer moves away from the source with velocity V1, the apparent frequency is F2. If V is the velocity of sound in air and `"F"_1/"F"_2=2` then `"V"/"V"_1` is equal to ______.
The displacement-time graphs of two particles A and B are straight lines making angles of 30° and 60° respectively with the time axis. If the velocity of A is vA and that of B is vB, the value of vA/vB is ______.
The wavelength of two waves are 50 and 51 cm respectively. If the temperature of the room is 20°C then what will be the number of beats produced per second by these waves, when the speed of sound at 0°C is 332 m/s?
The width of a slit is 0.012 mm. Monochromatic light is incident on it. The angular position of first bright line is 5.2°. The wavelength of incident light is ______. [sin 5.2° = 0.0906].
In communication system, the process of superimposing a low frequency signal on a high frequency wave is known as ______.
A source of 300 Hz frequency, an observer and a wind are moving as shown in the figure with respect to the ground. The frequency heard by observation is ______.
(Take, the speed of sound in air = 340 m/s)
An astronaut is approaching the moon. He sends out a radio signal of frequency 5000 MHz and the frequency of echo is different from that of the original frequency by 100 kHz. His velocity of approach wrt, to the moon, is ______.
A progressive wave of frequency 500 Hz is travelling with a velocity of 360 m/s. How far apart are two points 60° out of phase?
If a string fixed at both ends vibrates in four loops. The wavelength is 10 cm. The length of string is ______.
