Doubling the wavelength of a photon would ______________ its energy
a. halve
b. double
c. quadruple
d. not change
a
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How did astronomers discover the relationship between spectral type and mass for main sequence stars?
A) by measuring stellar radii with very powerful telescopes B) by measuring the masses and spectral types of main-sequence stars in binary systems C) by using computer models of hydrogen fusion and stellar structure D) by comparing stars with the same spectral type but different luminosities
Which sugar is found in greater than normal amounts in the blood of a diabetic?
a. Sucrose b. Lactose c. Glucose d. Fructose
The lifetime of an excited nuclear state is 1.0 ns. What is the minimum uncertainty in the energy of this state? ( h = 1.055 × 10-34 J ? s = 6.591 × 10-16 eV ? s, 1 eV = 1.60 × 10-19 J)
A) 3.3 × 10-7 B) 1.0 × 10-9 C) 6.6 × 10-7 D) 6.6 × 10-25 E) 1.0 × 10-25
A block of wood is floating in water. If the temperature of the water increases, what happens to the fraction of the block above water?
a. It increases. c. It stays the same. b. It decreases. d. It can be any of the above answers depending on the initial and final temperatures.