What is the lifetime on the main sequence of a 2-solar-mass star compared to the approximately 10-billion-year life of our Sun? Pick the best answer
a. 1.8 × 10^11 years
b. 1.8 × 10^10 years
c. 1.8 × 10^8 years
d. 1.8 × 10^6 years
e. 1.8 × 10^3 years
c
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Al is moving by you at a very high speed (close to the speed of light). You get out a clock and measure 10 seconds going by. If you also watch a clock in Al's ship, how much time will you see it record during your 10 seconds?
A) You will see Al's clock record less than 10 seconds. B) You will see Al's clock record more than 10 seconds. C) You will see Al's clock agree that 10 seconds go by.
In the ground state, the quantum numbers (n, ?, m , ms) for hydrogen are, respectively,
A) 1, 1, 1, 1. B) 1, 0, 0, 0. C) 1, 0, 0, ±1/2. D) 1, 1, 1, ±1/2. E) 1, 1, 0, ±1/2.
The celestial object _______________ is just one of many small objects that orbit the Sun beyond Neptune
Fill in the blank(s) with correct word
Lightning bolts occur between
a. Clouds and the ground. b. clouds. c. Both A and B.