Answer:
what is the question I cannot click the
Explanation:
The President is Xi Jinping
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.
Answer:
A
Explanation:
absolute magnitude and luminosity vs the spectral position/ temperature
B. Universal Gravitational Law