It is found that a particle in a one-dimensional box of length L can be excited from the n=1 to the n=2 state by the light of frequency ν. If the box length is doubled, the frequency needed to produce the n=1 to n=2 transition becomes

• a) ν/4
• b) ν/2
• c) 2ν
• d) 4ν
• e) None of the above is correct.