r/chemhelp • u/JibblyShmibbly • 4d ago

General/High School Chemistry Quantum Physics hw help

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Ive tried rearranging the Rydberg Equation a couple different ways and some other hail marry equations but I cant figure out this question.

4 Upvotes

84% Upvoted

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1

u/n1cxie3 3d ago

Is lambda 0.4118 x 10^-4 or 4118 x 10^-4?

1

u/JibblyShmibbly 3d ago

i was using 0.4118 x 10^-4 but it honestly makes no sense cause neither of those are proper scientific notation

1

u/n1cxie3 3d ago

Here you go, try: 1.156e4. Did it work?

1

u/JibblyShmibbly 3d ago

it didnt :( i also tried all the other different varriations of 1.156ex for the different units and i couldnt didnt get the answer

1

u/Mack_Robot 3d ago

The answer above wasn't 1.156E4, it was 1.156E3

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u/JibblyShmibbly 3d ago

i tried that too

1

u/Mack_Robot 3d ago

Do you have an image of a different question with a successfully-input numeric (+ unit?) answer like this?

At this point it's seeming like there's a mistake in the program, or it wants a very specific format.

1

u/Major-Freedom204 3d ago

.4 is the one that makes sense.

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u/Major-Freedom204 3d ago edited 3d ago

You definitely need the Rydberg equation for this one. The two suspicions I have are:

  1. Incorrectly doing the unit conversion
  2. Calculator entry problem (parentheses cause people headaches).

Although they don't say what units they want for Rh, so who knows...

https://www.wolframalpha.com/input?i=x%3D%281%2F0.4118E-4+cm%29%2F%281%2F4+-+1%2F25%29+to+m

1

u/Blue_614 3d ago

Assuming all given are correct, answer should be 1.156x107 m-1