What is the energy of a 633 nm photon?
A) 0.32 eV
B) 3.14 eV
C) 5.1 eV
D) 1.96 eV
E) 0.51 eV
D
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The hydrogen Balmer line H? has a wavelength of 486.1 nm in the laboratory. It is observed in a quasar at 2430.5 nm. What is the change in wavelength (in nm) of this quasar? Is it a "redshift" or "blueshift"?
a. 0; no change b. 2430.5; redshift c. 486.1; blue shift d. 1944.4; blueshift e. 1944.4; redshift
A projectile is projected from the origin with a velocity of 25.0 m/s at an angle of 45.0 degrees above the horizontal. What is the time it takes for the projectile to hit the ground?
A. 1.95 s B. 2.22 s C. 2.75 s D. 3.04 s E. 3.61 s
A Carbon-14 nucleus decays to a Nitrogen-14 nucleus by beta decay. How much energy (in MeV) is released if Carbon-14 has a mass of 14.003074 u and Nitrogen-14 has a mass of 14.003242 u?
What will be an ideal response?
For electric power that costs 10 cents per kilowatt hour, the cost of operating a 110-V heater that uses 20 A for 10 hours is
A) $0.22. B) $0.55. C) $2.20. D) $5.50. E) none of the above