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
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
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