What causes stars to twinkle?
a. bending of light rays by turbulent layers in the atmosphere variable absorption by interstellar gas along the line of sight to the star
b. it is intrinsic to the stars–their brightness varies as they expand and contract.
c. variations in the absorption of the atmosphere the inability of the human eye to see faint objects

What are segments of dna that code for a particular trait. a combination of dna and proteins make up what

Which statement correctly describes the relationship between frequency and wavelength?

The intensity of a polarized electromagnetic wave is 12 w/m^2. part a) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=0∘ with the plane of polarization? part b) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=30∘ with the plane of polarization? part c) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=45∘ with the plane of polarization? part d) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=60∘ with the plane of polarization? part e) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=90∘ with the plane of polarization?