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1. The problem statement, all variables and given/known data

My younger sister has a problem stated:

"An electromagnetic wave is found to have a frequency of 7.8x10^{-10}Hz. What is the speed of the wave?"

2. Relevant equations

3. The attempt at a solution

It's been a while since I have done this, and I'm a little confused. I know that you typically use the formula: C=λv (C= speed of light, λ= wavelength, v=frequency). I'm not sure, but I was thinking maybe it's a trick question, because I thought electromagnetic waves all travel at the speed of light (~3x10^{8}m/s). Am I correct in assuming this?

Any help is appreciated.

Thanks.

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# Basic physics question?

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