Planck's Theory: The Birth of Quantum Mechanics

Max Planck's theory of black body radiation, proposed in 1900, introduced the concept of quantized energy packets called quanta. Planck suggested that solid objects emit electromagnetic radiation in discrete packets, with energy directly proportional to the frequency of the radiation. This relationship is expressed in the equation E = nHν, where H is Planck's constant. Planck's theory successfully explained the distribution of radiation intensity as a function of wavelength, marking a significant advancement in understanding electromagnetic radiation.

What did Max Planck propose about the emission of electromagnetic radiation from heated solid objects?

• It is emitted in the form of waves.

• It is emitted continuously.

• It is emitted in packets called quanta.

• It is emitted only at high temperatures.

In Planck's theory, what is the term used for the smallest quantity of energy in the case of light?

• Proton

• Neutron

• Photon

• Electron

According to Planck, how is the energy of a quantum of radiation related to its frequency?

• It is inversely proportional.

• It is directly proportional.

• It is exponentially related.

• It is unrelated.

What is the value of Planck's constant as given in the video?

• 6.625 x 10^-34 Joule second

• 6.022 x 10^-23 Joule second

• 9.109 x 10^-31 Joule second

• 1.602 x 10^-19 Joule second

What does it mean when energy is said to be quantized?

• Energy is always decreasing.

• Energy can have any value.

• Energy is always increasing.

• Energy can only have fixed values.