Series/Parallel Circuits: If emf of the ideal battery is V = 100 V, what is the potential difference across R5 for the circuit shown in the figure?
A. 19 V
B. 40 V
C. 75 V
D. 77 V
Answer: A
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Observations indicate that the Moon has water ice in craters near the poles. Where do scientists suspect this water came from?
A) ice brought by comet impacts long ago B) ice supplied to the Moon by impacts that occurred within the past century or so C) the ice formed from the condensation of water released by outgassing on the Moon D) The Moon has significant amounts of water bonded in its crust, so some of this water fills the polar craters.
Within Earth's atmosphere the ozone layer is located:
A) in the troposphere. B) between the troposphere and the stratosphere. C) in the stratosphere. D) between the stratosphere and the mesosphere. E) in the mesosphere.
If you launch two probes in opposite directions from the Space Station, they will meet as they orbit Earth. According to general relativity, why does this happen?
A) They are following the straightest possible paths through space time, but those paths happen to meet. B) They are following the allowed orbits according to Newton's universal law of gravitation. C) The force of gravity tugs on the probes and forces them to orbit Earth. D) Objects launched in space always follow circular paths, no matter where they are.
A photocathode having a work function of 2.4 eV is illuminated with monochromatic light whose photon energy is 3.4 eV
What is maximum kinetic energy of the photoelectrons produced?(c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J) A) 1.6 × 10-19 J B) 3.8 × 10-19 J C) 4.4 × 10-19 J D) 4.9 × 10-19 J E) 5.4 × 10-19 J