Question

what is meant by quantum physics and what is meant by black body radiation?....

Answer 1

quantum theory:
it photosynthetically active radiation [par] is a part of the board spectrum of solar radiation that receive from the sun light contains visible light.
black body radiation:
an object that absorbs all radiation falling on it , at all wavelength, is called as black body radiation

Answer 2

Quantum physics

• it's the physics that explains how everything works: the best description we have of the nature of the particles that make up matter and the forces with which they interact. Quantum physics underlies how atoms work, and so why chemistry and biology work as they do.