Can you guys please explain to me planks hypothesis? This is what I know. But I need a better understanding:(adsbygoogle = window.adsbygoogle || []).push({});

Planck’s hypothesis was designed to explain the problem of black-body

radiation and the observed ‘ultraviolet catastrophe,’ not reconcilable with

classical physics. Classical physics predicted (via laws of thermodynamics) that

the radiation emitted by a black body was different to that observed in real life.

Classical theory predicted as the wavelength of the black body radiation

decreased, the radiance would increase to an infinite amount (could not be

reconciled with laws of conservation of energy). Thus an explanation had to be

found.

Planck proposed a theory of quantum physics, which stated that all energy is

quantised. As such, all the energy exchanged within the black body exists as

packets.

I need to know the mathematics behind Plank's Hypothesis, how did he come up with his explanation?

Einstein extended the concept of quantised energy to light waves, reasoning

that the energy from light waves may be treated as a stream of discontinuous

quanta, called ‘photons’. This contribution to quantum theory was based upon

Planck’s hypothesis on the quantisation of energy emitted from a black body.

A photon is the smallest amount of radiation energy possible at a particular

frequency. A photon cannot transfer part of its energy: it can only transfer all of

its energy or none of it. The amount of energy carried by a photon is

proportional to its frequency. The intensity of light is proportional to the number

of photons. The energy possessed by a photon is proportional to its frequency

(the shorter the wavelength - the higher the frequency - the greater the total

energy). The energy of photons is given by: E=hf.

So Plank's Hypothesis was limited to energy only, Einstein is the one who extended it to EMR?

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Plank's Hypothesis

**Physics Forums | Science Articles, Homework Help, Discussion**