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

Physics & Space Science

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Our Sun is considered to be a

A) low-mass star. B) intermediate-mass star. C) high-mass star. D) brown dwarf.

Physics & Space Science

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.

Physics & Space Science

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

Physics & Space Science

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