What happens to sound waves after they are received by our ears?

a.
the longitudinal compression waves are transmitted directly to the brain.
b.
the vibrational energy of the sound waves is converted into a mix of electric and mechanical signals and sent to the brain through two separate pathways.
c.
the vibrational energy of the waves is converted into electrical signals and sent to the brain.
d.
the longitudinal compression waves are converted into electromagnetic waves and sent to the brain.

C.

The vibrational energy of the waves is converted into electrical signals and sent to the brain.

Explanation:

Option C

Explanation:

The sound waves that travels to ear are send to the brain in order to hear it. The waves are in the form of vibration energy which is received by the ear. These signals are converted from the vibration into electrical signals.

These signals from the ear are sent to the brain in the form of electrical energy. These signals are processed there only and the feedback is reverted by the brain cells to the body.

Hence, the correct answer is option C  

powerful computers now, not then

scattering of light by tiny particles in air to produce the colors we see on sky, is dependent on the following factors:

(i) wavelength of light

(ii) size of the scattering particle  

(iii) distance traveled by light through the atmosphere.

according to rayleigh's law of scattering, the amount of scattering is inversely proportional to the fourth power of its wavelength. shorter the wavelength, greater is its scattering. hence violet/blue light is scattered more than red.

sun's light is a composite light ( visible light) with wavelengths in the range 400 nm (violet) to 700 nm (red). as sunlight passes through our atmosphere, the molecules of air scatter light according to their wavelengths. during sunrise and sunset, the sun's position is below the horizon. hence light from the sun travels a greater distance in the atmosphere when compared to its position a noon.

as sunlight enters the earth's atmosphere, blue light is scattered away and at the end of its journey in the sky, only red and orange wavelengths remain in the beam.

hence at sunrise and sunset, the sky appears reddish orange.