Scientists have noted that at present the Earth is closest to the sun in January and farthest from the sun in July. The reverse will be true in 13,000 years and the Earth will then be closer to the sun in July than January. How does Earth's current proximity to the sun affect the climate in the Northern Hemisphere? Winters are cooler and summers warmer because of the closer proximity of the Earth to the sun.
Winters are warmer and summers cooler because of the closer proximity of the Earth to the sun.
Winters are shorter and summers longer because of the closer proximity of the Earth to the sun.
Winters are longer and summers shorter because of the closer proximity of the Earth to the sun.

b mirrors submit a iisner? e. for which optical devices does d sometimes have a positive value? o a a and b o b. a and c o c. b and d 0 d. b and cb

we need to know the time interval during which the force acts. impulse of force = momentum change

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.

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2