Which statement is true?

Question

A. Waves with the longest wavelengths have the most energy.
B. Waves with the shortest wavelengths have the lowest frequencies.
C. Waves with the longest wavelengths have the lowest frequencies.
D. Waves with the highest frequencies have the longest wavelengths.

Answer 1

You need two equivalencies to answer this.
For Energy = hc/wavelength so that tells you that longer wavelengths give you lower energy OR
Energy = h*frequency so the higher frequency gives you higher energy.
For frequency vs wavelength you have c = freq x wavelength so long wavelength is higher freq and short wavelengths is higher frequency.