Which of the following statements about quantum tunneling is not true?
A) Although it has been observed to occur, it violates all other known laws of nature and explaining it therefore represents a major challenge to physicists.
B) It is used in modern electronics and, in fact, our modern-day computers would not work without it.
C) It plays a crucial role in nuclear fusion in the Sun.
D) It allows electrons and other subatomic particles to pass through wall-like energy barriers even when it seems they do not have enough energy to get through the barriers.
A) Although it has been observed to occur, it violates all other known laws of nature and explaining it therefore represents a major challenge to physicists.
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Spaceman Speff orbits spherical asteroid X with his spaceship. To remain in a circular orbit at 421 km from the asteroid's center, he should maintain a speed of What is the mass of planet X? (G = 6.67 × 10-11 N ? m2/kg2)
A) 4.0 × 1019 kg B) 5.1 × 1017 kg C) 4.0 × 1016 kg D) 5.1 × 1014 kg
Which is the law of reflection?
a. The angle of incidence is the complement of the angle of refraction. b. The angle of incidence is one-half the angle of refraction. c. The angle of transmission is equal to the angle of incidence. d. The angle of incidence equals the angle of reflection. e. The angle of incidence is twice the angle of reflection.
The stability of a neutron star is expected only if a neutron star is a ____________
a. solid b. fluid c. gas d. All of the other choices are correct.
Force on a Moving Charge: A charged particle moving along the +x-axis enters a uniform magnetic field pointing along the +z-axis. Because of an electric field along the +y-axis, the charge particle does not change velocity. What is the sign of this particle?
A. positive B. negative C. The particle could be either positive or negative. D. None of these choices is correct.