What frequency must a photon have if it is to raise an electron in a hydrogen atom from the n = 2 to the n = 4 state?
A) 3.06 × 1014 Hz
B) 6.16 × 1014 Hz
C) 4.11 × 1014 Hz
D) 5.20 × 1014 Hz
E) 9.24 × 1014 Hz
B
You might also like to view...
A 25-kg piece of equipment can be hung by steel wires of length 1.00 m, 2.00 m, or 3.00 m. If all the wires have the same diameter, which one will stretch the greatest percent?
A) the 3.00-m wire B) the 1.00-m wire C) the 2.00-m wire D) They will all stretch by the same percent.
It is impossible to construct an engine that is more than 100% efficient. The physical law covering this case is
A. Kelvin's statement of the second law of thermodynamics. B. the third law of thermodynamics. C. the zeroth law of thermodynamics. D. the first law of thermodynamics. E. Clausius's statement of the second law of thermodynamics.
Henri Becquerel
A) discovered radium and polonium. B) discovered radioactivity. C) observed back-scattering from nuclei. D) invented the particle detector tube. E) proposed the tiny central nucleus idea.
Which is the smallest particle?
A) molecule B) atom C) proton D) neutron E) quark