You can smell an open bottle of perfume in a room because . A. the liquid vaporizes and the resulting gas molecules wander about the room
B. the scent travels without needing a medium to travel through
C. the air molecules bond with some of the perfume, carrying it around the room
D. the perfume in the bottle is under pressure

i dont know but

explanation:

whoever your teacher is, deserves a raise for using pokemon as an example

he made 11 calls in one day

no. dot product   =0 when vecs at right angles

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.