A blueberry will look black when illuminated with
A) red light.
B) yellow light.
C) magenta light.
D) cyan light.
E) none of the above
Answer: B
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A solenoid of length 0.700 m having a circular cross-section of radius 5.00 cm stores 6.00 µJ of energy when a 0.400-A current runs through it. What is the winding density of the solenoid? (?0 = 4? × 10-7 T • m/
A) A) 865 turns/m B) 472 turns/m C) 1080 turns/m D) 104 turns/m E) 327 turns/m
A 9.00-µF and a 12.0-µF capacitor are connected together, and this combination is connected across a 25.0-V potential difference. How much electric energy is stored in the combination if they are connected (a) in parallel or (b) in series?
What will be an ideal response?
When we see that a spectral line of a galaxy is broadened, that is, spanning a range of wavelengths, we conclude that
A) we do not have very good resolution of a star's orbital velocity. B) there are many stars traveling at extremely high orbital velocities. C) there are different Doppler shifts among the individual stars in the galaxy. D) we are actually measuring the orbital velocity of a cloud of atomic gas. E) we are actually measuring the orbital velocity of dark matter.
According to Heisenberg's uncertainty principle, electrons are more unpredictable than protons. This is because electrons
A) are negatively charged rather than positively charged. B) interact more strongly with other particles. C) have a smaller mass. D) have a smaller volume E) interact more weakly (i.e., less strongly) with other particles.