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प्रश्न
Answer briefly.
Wave motion is doubly periodic. Explain.
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उत्तर
- A wave particle repeats its motion after a definite interval of time at every location, making it periodic in time.
- Similarly, at any given instant, the form of a wave repeats itself at equal distances making it periodic in space.
- Thus, wave motion is a doubly periodic phenomenon, i.e., periodic in time as well as periodic in space.
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संबंधित प्रश्न
Answer briefly.
Define wavelength of a wave.
Answer briefly.
Draw a wave and indicate points which are
- in phase
- out of phase
- have a phase difference of `pi/2`
Define the relation between velocity, wavelength, and frequency of the wave.
Define progressive wave.
State any four properties of progressive wave.
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
Solve the following problem.
A tuning fork of frequency 170 Hz produces sound waves of wavelength 2 m. Calculate the speed of sound.
The ratio of minimum to maximum wavelength in Balmer series is ____________.
In frequency modulated wave ______.
The frequency of a tuning fork is 384 per second and velocity of sound in air is 352 m/s. How far the sound has traversed while fork completes 48 vibration?
The wave of the wavelength 30 cm and frequency 100 Hz will be ______.
In a closed pipe, the note of fundamental frequency can be produced if the length of the air column is equal to ____________.
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 ______.
A progressive wave of frequency 50 Hz is travelling with velocity 350 m/s through a medium. The change in phase at a given time interval of 0.01 s 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?
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)
Two instruments having stretched strings are being played in unison. When the tension of one of the instruments is increased by 1%, 3 beats are produced in 2 s. The initial frequency of vibration of each wire is ______.
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 ______.
The energy of photon corresponding to a radiation of wavelength 600 nm is 3.32 × 10−19 J. The energy of a photon corresponding to a wavelength of 400 nm is ______.
