What is the mass of an electron in MeV/c2?
a. 0.511 MeV/c2
b. 105.7 MeV/c2
c. 1777 MeV/c2
d. none of the above
a
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Photon Energy: What is the wavelength of a 6.32-eV photon? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A. 197 nm B. 167 nm C. 216 nm D. 234 nm
If an object is stretched beyond the elastic limit, it enters the _______ on an applied force versus elongation graph for a typical metal
A) elastic region B) proportional region C) plastic region D) ultimate strength region E) breaking region
A quantity that has only a magnitude but no direction associated with it is called a __________
Fill in the blank(s) with correct word
Because of the period-luminosity relation for Cepheids and RR Lyrae variable stars, astronomers are able to _____
a. determine the relationship between the period of pulses and luminosity b. measure the mass of a star c. calculate a star's diameter d. determine the chemical composition of a Type I Cepheid e. narrow their study to eclipsing binary stars only