One star has a temperature of 30,000 K and another star has a temperature of 6,000 K. Compared to the cooler star, how much more energy per second will the hotter star radiate from each square meter of its surface?
a. 5 times
b. 25 times
c. 8.1 × 10^17 times
d. 625 times
e. 1.3 × 10^15 times
d
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Length Contraction: Observer A sees a ruler moving by in a relativistic rocket and measures its length to be LA. Observer B moves along with the rocket and measures the length of the ruler to be LB. What is true about these two length measurements?
A. LA > LB B. LA = LB C. LA < LB D. LA could be greater or smaller than LB depending on the direction of the motion.
Briefly summarize the observed patterns of motion in our solar system that are consistent with the nebular theory
What will be an ideal response?
What happens in electron capture?
a. The nucleus emits an electron, a neutron becomes a proton, and the atomic number goes up. b. The nucleus absorbs an electron, a proton becomes a neutron, and the atomic number goes down. c. The nucleus emits a positron, a neutron becomes a proton, and the atomic number goes down. d. The nucleus emits an electron, a neutron becomes a proton, and the atomic number goes down. e. The nucleus absorbs an electron, a proton becomes a neutron, and the atomic number goes up.
The last minerals to crystallize from a cooling magma have the
A) lowest melting point and the highest percentage of silica. B) lowest melting point and the lowest percentage of silica. C) highest melting point and the highest percentage of silica. D) highest melting point and the lowest percentage of silica.