Which of the following is the smallest dwarf planet?
a. Ceres
b. Mercury
c. Pluto
d. Eris
a
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In pair creation,
A) matter is conserved but energy is created. B) two oppositely-flavored pizzas are created. C) matter and energy are both conserved. D) matter and energy are both created. E) matter is created but energy is conserved.
The surface temperature of the star is 6000 K. At what wavelength is its light output a maximum? The constant in Wien's law is 0.00290 m ? K
A) 850 nm B) 907 nm C) 311 nm D) 483 nm E) 502 nm
Energy in Nuclear Reactions: An electron and a positron, both essentially at rest, annihilate each other, emitting two identical photons in the process. What is the wavelength of these photons? The mass of an electron or positron is 9.11 × 10-31 kg. (h = 6.626 × 10-34 J ? s, c = 3.00 × 108 m/s)
A. 1.21 × 10-12 pm B. 1.73 pm C. 2.42 pm D. 3.07 pm E. 3.46 pm
One phenomenon or experiment that supports the wave theory of matter is
A) the Michelson-Morley experiment. B) the tiny flashes that are observed when a light beam strikes a screen. C) interference effects with light. D) the tiny flashes that are observed when an electron beam strikes a screen. E) the double-slit experiment with electrons.