Find the average density of a white dwarf star if it has a mass equal to that of the Sun (2.0 × 10^30 kg) and a radius equal to that of the Earth (6.4 × 10^6 m)
a. 9.0 × 10^6 kg/m3
b. 1.8 × 10^7 kg/m3
c. 1.8 × 10^9 kg/m3
d. 3.6 × 10^10 kg/m3
e. 9.0 × 10^7 kg/m3
c
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Double-lobed radio galaxies are____
a. spiral galaxies with unusually luminous nuclei b. elliptical galaxies with very broad emission lines c. explained by the double-exhaust model d. extremely luminous objects with high redshifts e. glowing green gases due to excitation from energy from an active core
A car of mass M, traveling with a velocity V, strikes a parked station wagon, whose mass is 2M. The bumpers lock together in this head-on inelastic collision. What fraction of the initial kinetic energy is lost in this collision?
A) 1/4 B) 1/9 C) 1/2 D) 2/3 E) 1/3
A grating is made with 600 slits per millimeter. What is the slit separation?
A. 600 nm
B. 
C. 
D. 160 pm
E. 916 nm
The ionization energy for the hydrogen atom is 13.6 eV. What is the energy of a photon that is emitted as a hydrogen atom makes a transition between the n = 4 and n = 3 states?
a. 3.40 eV c. 6.80 eV b. 0.66 eV d. 2.55 eV