Which of the following was NOT a source of heat that helped differentiate the Earth?
A) solar radiation
B) impacts
C) gravitational potential energy
D) radioactive decay
A
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The diagram below illustrates the radioactive decay of Potassium (40K), which has a half-life of 1.3 billion years. If a lunar rock is found that currently contains 5 grams of 40K, and it is determined that the sample contained 20 grams when it was formed, how old is the lunar rock?
a.
6.5 billion years
b.
19.5 billion years
c.
2.6 billion years
d.
3.9 billion years
e.
4.6 billion years
Two flat conductors are placed with their inner faces separated by 6.0 mm. If the surface charge density on one of the inner faces is 40 pC/m2, what is the magnitude of the electric potential differences between the two conductors?
A. 36 mV B. 18 mV C. 32 mV D. 27 mV E. 14 mV
As a particle travels faster, its de Broglie wavelength
A) increases. B) decreases. C) remains constant. D) could be any of the given answers; it depends on other factors.
Why have refrigerators been the focus of so much research in lowering energy use?
What will be an ideal response?