The type of EM radiation that causes your skin to tan is
a. ultraviolet.
b. infrared.
c. x-rays.
d. microwave.
e. gamma rays.
a
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An electron with kinetic energy 2.80 eV encounters a potential barrier of height 4.70 eV. If the barrier width is 0.40 nm, what is the probability that the electron will tunnel through the barrier?
(1 eV = 1.60 × 10-19 J, mel = 9.11 × 10-31 kg, h = 1.055 × 10-34 J ? s, h = 6.626 × 10-34 J ? s) A) 3.5 × 10-3 B) 7.3 × 10-3 C) 1.4 × 10-2 D) 2.9 × 10-3 E) 3.5 × 10-2
Suppose an object is placed 6.0 cm in front of a lens that has a focal length of 4.0 cm. Where is the image located? What are the magnification and the character of the image?
A feature of the nuclear reactor at Chernobyl that contributed to the magnitude of the accident there was that
A. plutonium could build up quickly in the reactor. B. the reactor did not have control rods. C. water was used only as a coolant, not a moderator. D. the uranium fuel was more highly enriched.
A 100-kg person sits on a 5-kg bicycle. The weight is borne equally by the two wheels of the bicycle. The tires are inflated to a gauge pressure of 8.0 × 105 Pa and are 2.0 cm wide. What length of each tire is in contact with the ground?
A) 1.6 cm B) 1.8 cm C) 3.2 cm D) 2.4 cm E) 6.4 cm