1.Choose all that are true for pendulums. (multiple answers) Pendulums go through the equilibrium once every period.
For pendulums, the period is dependent on the mass.
The longer the string, the longer the period. The period of a pendulum is dependent on gravity.

2.Choose all that are true for springs. (multiple answers)
The more mass, the longer the period.
The bigger the spring constant, the shorter the period.
The more mass, the shorter the period.
The bigger the spring constant, the more rigid the spring.

​

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.

prndulum needs thread, weight clock to time swings

did yall get answers for this yet