When total internal reflection happens at a plastic-air interface
A. half the light is refracted.
B. half the light is reflected.
C. light hits the interface from the air side.
D. light hits the interface from the plastic side.
E. the law of reflection ceases to hold.
D. light hits the interface from the plastic side.
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Helium flash occurs
a. because helium is very explosive and cannot be controlled when the nuclear reactions occur. b. because degenerate electrons in the core do not allow the core to expand as it heats up. c. in Cepheid variables. d. in stars with masses less than 0.4 M. e. none of the above
When strong solar winds are displaced poleward by our magnetic fields, we get
A) the Van Allen radiation belts. B) intense auroral displays. C) sunspots. D) hurricanes in the tropics. E) droughts and dust bowls in the American West.
A charged particle (mass = 4.0 ?g, charge = 5.0 ?C) moves in a region where the only force on it is magnetic. What is the magnitude of the acceleration of the particle at a point where the speed of the particle is 5.0 km/s, the magnitude of the magnetic field is 8.0 mT, and the angle between the direction of the magnetic field and the velocity of the particle is 60°?
a. 39 km/s2 b. 43 km/s2 c. 48 km/s2 d. 52 km/s2 e. 25 km/s2
The Big Bang is regarded as the expansion of
A) space. B) energy. C) time. D) matter.