Aditi clapped her hands near a cliff and heard the echo after 4 seconds. what is the distance of cliff from her if the speed of sound is taken as 346ms-1

Given

Speed of sound (u)=346 m/s

Time taken for hearing the echo (t)=4s

Now

speed=

time

distance

⇒346=

4

distance

⇒distance =(346×4)=1384.

Total distance covered by sound is 1384 m

In 4 s, sound has to travel twice the distance between the cliff and aditi.

Therefore, the distance between the cliff and aditi is =

2

1384

 m=692 m

Distance of cliff from aditi =692 m.

Explanation:

my other one is no longer up sowwy for what i didn't do right hope this one is better have a good day hope the best comes to you

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.