A certain laser radiates with a wavelength of 2488 nm. What is the energy difference, in electron volts, between the two energy levels involved in producing this light?
A) 0.50 eV
B) 0.65 eV
C) 0.45 eV
D) 0.60 eV
E) 0.55 eV
A
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Which of the following is not consistent with observations of the cosmic microwave background?
A) The universe is at least 20 billion years old. B) The universe is geometrically "flat" (in the four dimensions of spacetime). C) Dark energy, whatever it is, represents the majority of the energy content of the universe. D) The matter density (both luminous and dark matter combined) in the universe is only about one-fourth of the critical density.
Draw and label a simple diagram of the following:
a. a refracting telescope b. a reflecting telescope What will be an ideal response?
Using the Rayleigh criterion, one concludes that using fixed wavelength light that it is not possible to resolve details less than about
A) 0.5 wavelength. B) 0.1 wavelength. C) one wavelength. D) 10 wavelengths. E) 122 wavelengths.
Atomic Nucleus: Name the first three isotopes of hydrogen, write their symbols in standard notation, and indicate which one is the most common and which one is the most unstable.
What will be an ideal response?