[test1234567]

1)An alpha particle is spontaneously emitted from an atom of Radium (Ra) with an energy of 5.5 MeV. The alpha particle has a mass of 6.6 x 10-27 kg. What is the deBroglie wavelength of the alpha particle in meters?

2)Calculate the wavelength in nanometers for the photon absorbed  when a hydrogen atom undergoes the transition from n = 1 to n = 5


Thanks...just any help for some direction would be awesome. thank you!

[enahs]

This is just simple application of a couple of your formulas (but there is science behind them!)
For 1) Look up in your book/notes/internet the "de Broglie relation" or "de Broglie Wave Equation", etc.
For 2) Look in your book/notes/internet for th "Rydberg Equation" or "Rydberg Formula" etc, it should be near the "de Broglie relation".

[test1234567]

for this problem:

Calculate the wavelength in nanometers for the photon absorbed  when a hydrogen atom undergoes the transition from n = 4 to n = 5

Enter your answer here:  nm

i tried to do:

1.0974x107 m-1 * (1/16) - (1/25)

and i got 246915

not right though.

[enahs]

Units units units units units!!! Always work with your units.

Your Rydberg constant is in meters, not nanometers. But, look at the equation, it does not = the wavelength, it equals reciprocal wavelength ( 1/wavelength , in math notation wavelength^-1).
You need to take the reciprocal of that answer, and you have the wavelength in METERS, you must then convert to nanometers.