What physical process results in the convection of thermal energy?
a. Collisions between the particles in a material.
b. The movement of a fluid through a space.
c. The energy exchange when a liquid becomes a gas.
d. The energy transferred by electromagnetic waves traveling between objects.
e. Brownian motion.
b
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X-ray bursters occur in binary star systems. The two types of stars that must be present to make up such an object are:
A) a white dwarf and a neutron star. B) a contact binary system of two red giants. C) a white dwarf and a main sequence star. D) a main sequence or giant star and a neutron star in a mass transfer binary. E) two neutron stars in a mass transfer binary.
You observe the same spectral line in two stars that are identical in every way except that one rotates faster than the other. How does the spectral line differ between the two?
A) There is no difference. B) The line in the faster rotating star is blueshifted. C) The line in the faster rotating star is redshifted. D) The line in the faster rotating star is broader. E) The line in the faster rotating star is narrower.
What is the velocity of propagation if a wave has a frequency of 12. Hz and a wavelength of 3.0 m?
A) 4.0 m/s B) 6.0 m/s C) 0.25 m/s D) 28 m/s E) 36 m/s
Suppose you wanted to hold up an electron against the gravitational force by the attraction of a fixed proton some distance above it
How far above the electron would the proton have to be? (k = 1/4??0 = 9.0 × 109 N ? m2/C2, e = 1.6 × 10-19 C, mproton = 1.67 × 10-27 kg, melectron = 9.11 × 10-31 kg) A) 1.5 m B) 2.3 m C) 3.7 m D) 4.6 m E) 5.1 m