How many times greater is the speed of infrared light (? = 800 nm) than the speed of violet light (? = 400 nm) in a vacuum?
a. 2
b. 1/2
c. 400
d. 1; that is, both have the same speed.
d
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A proton moving with a velocity of 4.0 × 104 m/s along the +y-axis enters a magnetic field of 0.20 T directed towards the -x-axis. What is the magnitude of the magnetic force acting on the proton? (e = 1.60 × 10-19 C)
A) 8.0 × 10-15 N B) 1.3 × 10-15 N C) 0 N D) 3.9 × 10-15 N E) 2.6 × 10-15 N
What type of geological activity is seen on Neptune's moon Triton?
a. Plate tectonics and earthquakes are a common occurrence on Triton. b. Volcanoes of molten lava, similar to Earth, have been seen there. c. Geysers of liquid nitrogen are seen erupting from its surface. d. Geysers of liquid water are seen erupting from its surface.
Which of the following is a key factor in explaining why many jovian moons have been more geologically active than the Moon or Mercury?
A) Jovian moons contain much more ice that can melt or deform at lower temperatures than can the rock and metal that make up the Moon and Mercury. B) The jovian moons are considerably larger than the Moon and Mercury and therefore have retained much more internal heat. C) The jovian moons probably have far more internal heat generated by radioactive decay than do the Moon or Mercury. D) Because of their greater distances from the Sun, the jovian moons receive much less heat from the Sun.
Which of the following is true? The number of daylight hours depends on
a. the International Date Line. b. the longitude. c. the latitude. d. all of these.