Question

Compare photons of ultraviolet and infrared radiation. which has: the longer wavelength? the greater frequency? the greater energy?

Answer 1

Wavelength of infrared ~ 10⁻⁵ m.
Wavelength of Ultraviolet ~ 10⁻⁸ m.
∴ Wavelength of infrared  > Wavelength of Ultraviolet 

Frequency α 1/wavelength
∴ Frequency of UV photon > Frequency of infrared photon

Energy of photon α frequency.
∴Energy of UV photon > Energy of infrared photon