A substance most commonly emits heat energy by the process of
A) conduction.
B) convection.
C) radiation.
D) none of the above
Answer: C
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The coefficient of linear expansion for brass is 19. × 10-6 K-1. What is its coefficient of volume expansion?
A) 5.7 × 10-5 K-1 B) 8 × 10-18 K-1 C) 57. × 10-5 K-1 D) 3.8 × 10-6 K-1 E) 38. × 10-6 K-1
A solid object is made of two materials, one material having density of 2000 kg/m3 and the other having density of 6000 kg/m3 . If the object contains equal masses of the materials, what is its average density?
a. 3000 kg/m3 c. 5000 kg/m3 b. 3200 kg/m3 d. more information is needed
Scientists were led to postulate the existence of the neutrino in order to
A) maintain the conservation of energy and of momentum in beta decay. B) provide a mechanism for quark production. C) account for alpha decay. D) explain the intense radiation emitted by quasars.
As a monochromatic light ray is transmitted through an air-to-glass boundary, what happens to the wavelength?
a. increases b. decreases c. remains unchanged d. approaches zero value