Which of the following occurs as light travels farther from its source?
a. far from the source, photons come together in a small area.
b. the intensity of light increases as photons move away from the source.
c. far from the source, photons spread over a larger area.
d. the source gives off less light as photons move away from it.

Ateam of astronauts is on a mission to land on and explore a large asteroid. in addition to collecting samples and performing experiments, one of their tasks is to demonstrate the concept of the escape speed by throwing rocks straight up at various initial speeds. with what minimum initial speed vesc will the rocks need to be thrown in order for them never to "fall" back to the asteroid? assume that the asteroid is approximately spherical, with an average density p 3.84 x108 g/m3 and volume v 2.17 x 1012 m3 recall that the universal gravitational constant is g 6.67 x 10-11 n m2/kg2

Unpolarized light of intensity so passes through two sheets of polarizing material whose transmission axes make an angle of 60∘ with each other as shown in the figure. what is the intensity of the transmitted beam, st?

True or false when elements combine to form a mixture, the resulting chemical properties may be very different from those of the elements that make it.