For monochromatic radiation incident on a photocathode, assume the quantum efficiency does not vary appreciably over the frequency range considered. Which statements are correct?

Select all that apply

• Option A

  At fixed frequency, photon flux is proportional to radiation intensity

• Option B

  At fixed intensity, photon flux is inversely proportional to photon frequency

• Option C

  At fixed optical power, halving the wavelength halves the number of photons delivered per second

• Option D

  At fixed photon flux, increasing frequency decreases the incident optical power