Millikan's experiments on balancing charged oil droplets in an electric field first showed that:
a. electrons have a definite charge to mass ratio, which he measured.
b. electric charges are integer multiples of a single fixed electron charge, which he measured.
c. photons have energy E = hf for frequency f.
d. electrons have negative charge.
e. protons are positively charged.
b
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The atmospheric pressure at the surface of the terrestrial planets increases as their distance from the Sun increases.
Answer the following statement true (T) or false (F)
Using a lever to move a rock reduces the force a person must exert. What does it do to the work the person must do?
a. it reduces the work also b. the work stays the same c. the work increases d. none of the above
The CNO cycle produces energy by fusing
A. silicon into iron. B. hydrogen into helium. C. neon into magnesium and oxygen. D. carbon and nitrogen into oxygen.
The surface of Venus is much hotter than the Earth because it
A) has no magnetic field B) has a very thick atmosphere of carbon dioxide C) has a much higher rate of volcanic activity D) is closer to the Sun