An electron microscope operates with electrons of kinetic energy 100 keV. What is the wavelength of these electrons? Assume this speed is not relativistic. (h = 6.63 × 10^-34 J×s, c = 3.00 × 10^8 m/s, 1 eV = 1.60 × 10^-19 J, and me = 9.11 × 10^-31 kg)
a. 5.49 × 10^-12 m
c. 9.28 × 10^-10 m
b. 7.14 × 10^-11 m
d. 3.88 × 10^-12 m
D
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White dwarf supernovae are good standard candles for distance measurements because
A) all white dwarf supernovae have about the same peak luminosity. B) all white dwarf supernovae occurred at about the same time in the history of the universe. C) all galaxies have at least one white dwarf supernova each year. D) white dwarf supernovae occur only among very massive stars. E) all white dwarf supernovae start out bright and fade with time.
A 328-kg car moving at 19.1 m/s in the +x direction hits from behind a second car moving at in the same direction
If the second car has a mass of and a speed of right after the collision, what is the velocity of the first car after this sudden collision? A) 18.2 m/s B) -14.0 m/s C) 24.2 m/s D) 14.0 m/s
For the gray opaque surface having the spectral emissivity given in the figure, determine the spectral reflectivity.
Aside from Earth, Venus is the most likely place for life to exist in the Solar System
a. True b. False Indicate whether the statement is true or false