Answer:
D.number of photons emitted.
Explanation:
These are the options for the question
A.propagation speed of the radiation.
B.wavelength of the radiation.
C.polarization of photons emitted.
D.number of photons emitted.
.
Electromagnetic energy of any radiation is proportional to the photons present. And we know that intensity is ratio of energy and unit time.
Hence, The intensity of the radiation emitted by the oxygen sensor is directly proportional to the number of photons emitted
