As a Sun-like main-sequence star exhausts hydrogen in its core, it next becomes
a. a protostar.
b. a red giant star.
c. a white dwarf star.
b
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If a beam of electromagnetic radiation has an intensity of 120 W/m2,
what is the maximum value of the electric field? (c = 3.0 x 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2) A) 1.5 kV/m B) 1.0 µT C) 1.0 µV/m D) 0.30 kV/m E) 0.0032 V/m
Two pulses are traveling towards each other at 10 cm/s on a long string at t = 0 s, as shown below
Which diagram below correctly shows the shape of the string at 0.5 s?
a.
Physics & Space Science
Our Sun is considered to be a
A) low-mass star. B) intermediate-mass star. C) high-mass star. D) brown dwarf.
How are the polar regions of Mercury and the Moon similar?
A) Both are covered by huge mare-type basins from impacts. B) Both seem to have ice pockets in the deepest, darkest crater floors. C) Both have bright dry ice polar caps, like Mars. D) Both have lakes of liquid water under their regolith. E) Both have been hit by large comets that melted there.