i got these questions wrong on my test and i would like to know the answer to th

Question

i got these questions wrong on my test and i would like to know the answer to these. Thanks.

1) What is the frequency of a photon emitted by a helium-neon laser if it has a wavelength of 0.632 um (micrometers)?

2)A magnetic resonance imager (MRI) emits photons with a frequency of 100. MHz. What is the energy in Joules for 0.500 moles of these photons?

3)The photoelectric effect occurs when sufficient energy is delivered to a metal atom to eject an electron from the atom that can produce an electric current and form a metal cation. Circle the energy transition in a hydrogen atom that is most likely to produce the photoelectric effect in a metal. Briefly explain the reasons for your selection.

Choose one: n=4->n=3 OR n=3->n=2

Brief Explanation?

Explanation / Answer

1) f = c/lamba = 4.72*10^15 Hz 2) E = hf = 6.26*10^-26 J/mol for 0.5 mol = 3.31*10^-26 J 3)the higher th n the lower the energy, work function of metal so n= 4

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