student presentation general physics 1 Presentation 2 group 5 Physics Nobel Prize Winner 21 Feb 2009

1. Max Planck

2. Content Bibliography Work life Physic Theory

7. Max Planck’s Works and Discoveries As Planck w as conducting an experiment, he found that experimental observations on the wavelength distribution of the energy emitted by a black body as a function of temperature were inconsistent with the predictions of classical physics . However, he was able to deduce the relationship between the energy and the frequency of radiation . In 1900, he announced his derivation of the relationship that the energy emitted by a resonator could only take on discrete values or quanta . The energy for a resonator of frequency v is hv where h is a universal constant, now called Planck's constant .

8. Planck’s Works -Planck’s law of Black-body radiation -Planck’s Constant -Planck Postulate

9. What is Black body? A black body is an object that absorbs all electromagnetic radiation that falls on it . No electromagnetic radiation passes through it and none is reflected. Because no light ( visible electromagnetic radiation ) is reflected or transmitted. A black body at temperature T emits exactly the same wavelengths and intensities which would be present in an environment at equilibrium at temperature T , and which would be absorbed by the body . Since the radiation in such an environment has a spectrum that depends only on temperature, the temperature of the object is directly related to the wavelengths of the light that it emits . The light emitted by a black body is called black-body radiation .

13. A closely related constant is the reduced Planck constant , denoted ħ ("h-bar") , which is equal to the Planck constant divided by ( or reduced by ) 2 π. T he reduced Planck constant is used when frequency is expressed in terms of radians per second instead of cycles per second . The expression of a frequency in radians per second is often called angular frequency ( ω ) , where ω = 2 π ν .