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Waves of light are ...........

Waves of light are ........

A

non-mechanical and longitudinal waves

B

mechanical and longitudinal waves

C

non-mechanical and transverse waves

D

mechanical and transverse waves

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non-mechanical and transverse waves
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Fig. shows a surface XY separating two transparent media, medium 1 and medium 2. Lines ab and cd represent wavefronts of a light wave travelling in medium 1 and incident on XY. Line ef and gh represent wavefront of the light wave in medium 2 after rafraciton. Speed of light is

Fig. shows a surface XY separating two transparent media, medium 1 and medium 2. Lines ab and cd represent wavefronts of a light wave travelling in medium 1 and incident on XY. Line ef and gh represent wavefront of the light wave in medium 2 after rafraciton. Light travel as a

Light waves travel from optically rarer medium to optically denser medium. Its velocity decreases because of change in .......

A diffraction pattern is formed by blue light, if blue light is replaced by yellow light, then ......

If waves of light having intensity I_(1) and I_(2) passes through any region in the same time in the same direction, what will be sum of maximum and minimum intensity ?

Displacement of two light waves are e_(1)=4 sin omega t and e_(2)= 3 sin (omegat + pi/2) . so amplitude of resultant wave = .....

What was the difficulty in established the wave theory of light and who explained it ?

What is the effect on the speed and wavelength of light when the light wave refracted from denser medium to rarer medium ?

Speed of light wave of 5000 Å wavelength produced from a star is 1.5 xx 10^(6) m//s , then change in wavelength when it reaches to Earth is ......

Huygen was the figure scientist who proposed the idea of wave theory of light he said that the light propagates in form of wavelengths. A wavefront is a imaginary surface of every point of which waves are in the same. phase. For example the wavefront for a point source of light is collection of concentric spheres which have centre at the origin w_(1) is a wavefront w_(2) is another wavefront. The radius of the wavefront at time 't' is 'ct' in thic case where 'c' is the speed of light the direction of propagation of light is perpendicular to the surface of the wavelength. the wavefronts are plane wavefronts in case of a parallel beam of light. Huygen also said that every point of the wavefront acts as the source of secondary wavelets. The tangent drawn to all secondary wavelets at a time is the new wavefront at that time. The wavelets are to be considered only in the forward direction (i.e., the direction of propagation of light) and not in the reverse direction if a wavefront w_(1) and draw spheres of radius 'cDeltat' they are called secondary wavelets. Draw a surface w_(2) which is tangential to all these secondary wavelets w_(2) is the wavefront at time t+Deltat Huygen proved the laws of reflection and laws of refraction using concept of wavefront. Q. A point source of light is placed at origin, in air. the equation of wavefront of the wave at time t, emitted by source at t=0 is (take refractive index of air as 1)

KUMAR PRAKASHAN-SOUND-QUESTIONS AND ANSWERS (Choose the correct option from those given below cach question:)
  1. The distance between two consecutive conden sations in the sound wave ...

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  2. In the air, the velocity of sound wave is 340 ms^(-1) and wavelength i...

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  3. Waves of light are ........

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  4. On which of the following factors does the velocity of wave not depend...

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  5. The wavelength of the wave produced on the surface of water is 2 cm. I...

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  6. Two waves produced from a source are shown in the following figure. St...

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  7. Wave of which of the following frequenciescould we hear?

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  8. What is the frequency range of audible sound wave?

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  9. Which type of sound waves does the bat produce?

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  10. Who can experience ultrasonic sound?

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  11. Which waves are used in ECG technique?

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  12. Whose unit is decibel (dB)?

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  13. The SI unit of intensity of sound is ........

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  14. Note is a sound which is ........

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  15. The key of the mechanical plano is pressed (struck) first lightly and ...

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  16. In SONAR ......... waves are used.

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  17. When sound waves propagate in air……..

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  18. When we convert soft sound in to loud sound, we increase its

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  19. ....... can hear Infrasonic sound.

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  20. In the begining of music programme, the sitarist changes / adjusts the...

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