# Vibrational Frequency

1. Nov 8, 2005

### jdog6

The mass of the deuterium molecule is twice that of the hydrogen molecule. If the vibrational frequency of helium is 1.34x10^14 Hz, what is the vibrational frequncy of deuterium, assyming that the spring constant of attracting forces is the same for the two species? Answer in units of Hz.

frequency: w=square root of k/m

....???

Please help thank you.

2. Nov 8, 2005

### Andrew Mason

You have correctly used: $$\omega = 2\pi f = \sqrt{\frac{k}{m}$$

So what is $$f_{1}/f_{2}$$?

AM

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