If two stars are emitting the same amount of light, the star that is farther will appear
a. brighter.
b. dimmer.
c. redder.
d. bluer.
e. They will have the same brightness as seen from Earth.
B
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Suppose two flat glass plates 30-cm long are in contact along one end and separated by a human hair at the other end. If the diameter of the hair is 50 ?m, find the separation of the interference fringes when the plates are illuminated by green light, ? = 546 nm.
What will be an ideal response?
How did Brahe measure highly accurate planetary positions?
A) By careful measurements of the brightness of the planets, as seen from Earth. B) With larger and more elegant sighting instruments. C) By his invention of the technique know as triangulation (measuring the distance between 2 points, and measuring 2 angles, to determine the distance to a 3rd point). D) With the recently-invented telescope. E) With a new type of telescope that used mirrors instead of lenses.
Two waves travel simultaneously through the same medium. The first wave is described by y1(x,t) = Acos(kx-?t) and the second wave by y2(x,t) = B sin(kx-?t)
If the resulting superposition can be written as y(x,t) = C cos(kx-?t + ?/5 ), what is the value of A/B? A) sin(?/5 ) B) cos(?/5 ) C) cot(?/5 ) D) sec(?/5 ) E) tan(?/5 )
Which of the following phenomena is not commonly associated with the star formation process?
A) strong winds of particles blowing out into space from a protostar B) powerful "jets" shooting out along the rotation axis of a protostar C) the formation of a spinning disk of material around a protostar D) intense ultraviolet radiation coming from a protostar