Shrajesh thapa

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Asked Questions

1. Distinguish between musical sound and noise.

Noise	Music
Sounds which are not pleasant to hear is called Noise	Sounds which are pleasant to hear is called Music
We do not like such sounds	We like such sounds
Example Sounds produced by musical instruments like guitar, piano	Example Sounds of Vehicles Bursting of Crackers

1. The equation of a light wave is written as y=Asin(kx-wt). What does y represent?

In the equation y = A sin (kx-wt), 'y' represents the displacement of particles of the medium about the mean position.

What does speed of light depend on?

The speed of light is the universal speed limit, and also a universal constant. But the measured speed of light may be varied according to the change in optical density.

The speed of light depends on:

1. Optical Density
2. Permittivity of the medium
3. Permeability of the medium

1. What is the shape of wavefront when source of light is linear source?

If the source is linear, we can get cylindrical wavefronts.

1. What is the shape of wavefront when source of light is linear source?

If the source is linear, we can get cylindrical wavefronts.

1. What is the shape of wavefront when source of light is a point source?

We can obtain a spherical wavefront from the point source.

1. What are secondary wavelets?

According to Huygen's principle, each point on a wave acts as a source of the new disturbance. This new disturbance is called secondary wavelet.