How Does Deuterium's Vibrational Frequency Compare to Helium's?

[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.

 

[Andrew Mason]

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

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

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

AM