Answer:
a,e,d
Explanation:
i got it right when i was doing study island
Change in color
Change in color is a physical reaction
Answer:
Photons.
Explanation:
Einstein explained the photoelectric effect by proposing that light is transmitted, not in the form of continuous waves, but in the form of many tiny, discrete packets of energy called photons. Photons are massless and chargeless particle. The energy of a photon is given by :

f is the frequency of photon.
I think the answer would be C