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1. What is the wavelength of a 29.00E9 Hz radar signal.

I did wavelength = c/f = 3.00E8m/s divided by 29.00 Hz and got 0.01034, but it is telling me that it is wrong.

2. An em wave has a wavelength of 850nm, what is the frequency.

I did f = c/wavelength = 3.00E8m/s divided by 850E-9 m and got 3.53E14, and it told me it was wrong.

3. Calculate the frequency of green light with a wavelength of 540nm and yellow light with a wavelength of 580nm. I did freq of green = c/wavelength = 3.00E8/540E-9 and got 5.56E14 which was wrong, and 3.00E8/580E-9 = 5.17E14 which was also wrong.

4. A start is 2.1 light years away. How far is it away in meters? I converted 2.1 years to seconds, and then divided 3.00E8/2.1 years in seconds and got 9.06m, which was also wrong.

I know these problems are easy but I am frustrated with them because I can't get them right, I would really appreciated it if someone could help me out.