Need to calculate frequency, wavelenvth, and energy for light?

Question

I was given v=f(wavelength) and E=hf
one of the problems gives:
wavelength: 10^2m/s - 10^4m/s
energy: 10^-26J - 10^-27J

i used v=f(wavelength) to get 3.0*10^6Hz - 3.0*10^4Hz
If i use teh other equation, I get a completely different answer....
am i doing osmething wrong?

Answer 1

Using Planck's constant of 6.626 x 10-34 Joule-seconds

I get something on the order of 1.5 to 15 GigaHz for those energies.

I notice you have wavelength in m/s instead of meters. You might want to check you read the problem correctly.

Answer 2

Yes, you are doing something wrong ☺
But the thing you give for wavelength is also wrong (wavelength is given in meters, not m/s) and doesn't make sense (it's the -difference- of something?). Also, the thing you have for energy simply doesn't make sense for the same reason.

Doug