What is the energy of a photon whose frequency is 2.9 × 10^20 Hz? (h = 6.63 × 10^?34 J?s and 1 eV = 1.60 × 10^?19 J)
a. 0.2 MeV
b. 1.2 MeV
c. 1.9 MeV
d. 3.1 MeV
e. 0.8 MeV
b
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The ultraviolet catastrophe predicts that:
a. all objects should radiate extreme amounts of ultraviolet light. b. as an object gets hotter its light will change from dull red to blue white. c. a black body can absorb an infinite amount of radiation if the radiation is in the ultraviolet region. d. the radiated energy approaches zero as the wavelength approaches zero.
The change in entropy of 20.0 moles of ideal monatomic constant volume gas as it changes from an initial temperature 300 K to its final temperature is 200 J/K. What is the final temperature of the gas?
A) 669 K B) 562 K C) 427 K D) 187 K E) 345 K
After a supernova explosion, the remains of the stellar core ________
A) will always be a neutron star B) may be either a neutron star or a black hole C) will always be a black hole D) may be either a white dwarf, neutron star, or black hole
Why does the temperature of the corona rise with latitude? a. Atoms undergo fission when repelled by the corona
b. Atoms become neutralized as they dissipate in higher altitudes. c. Atoms within the corona become more ionized at higher altitudes. d. Atoms are forced upward from the chromosphere to the corona. e. Atoms are less excited as they move from the photosphere to the corona.