What are the two most important properties for optical telescopes?
a. high magnification and high angular resolution.
b. high magnification and low angular resolution.
c. low magnification and large collecting area.
d. a large collecting area and high angular resolution.
e. a large collecting area and low angular resolution.
Ans: d. a large collecting area and high angular resolution.
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A particle (m = 2.0 ?g, q = ?5.0 ?C) has a speed of 30 m/s at point A and moves (with only electric forces acting on it) to point B where its speed is 80 m/s. Determine the electric potential difference VA ? VB
a. ?2.2 kV b. +1.1 kV c. ?1.1 kV d. +2.2 kV e. +1.3 kV
Two flat glass plates are in contact along one end and are separated by a sheet of paper 3.0 × 10^-6 m thick at the other end. The top plate is illuminated by a monochromatic light source of wavelength 490 nm. How many dark parallel bands will be evident across the top plate? (1 nm = 10-9 m) Note that a dark band occurs where the plates contact
a. 13 c. 9 b. 7 d. 17
Which of the lens shapes given below results in a diverging lens?
a. plano concave b. double convex c. convex meniscus d. None of the shapes listed will be diverging.
When it comes near a heavy nucleus, a gamma ray, which is a high energy photon, can "disappear," and in its place there will be produced an electron and a positron, which both have mass. According to special relativity, this pair production is an example of __________
Fill in the blank(s) with correct word