For which one of the following problems did Max Planck make contributions that eventually led to the development of the 'quantum' hypothesis?
Photoelectric effect
Uncertainty principle
The motion of the earth in the ether
Blackbody radiation curves
Approximately, what is the de Broglie wavelength of an electron that has been accelerated through a potential difference of 150 V? The mass of an electron is 9.11 x 10^-31 kg.
0.1 nm
1 nm
10 nm
100 nm
Incident X-rays in a Compton scattering experiment have a wavelength of 0.400 nm. Determine the wavelength of the scattered X-rays that are detected at an angle of 80.0°. The Compton wavelength of the electron is 2.43 x 10-12 m.
0.041 nm
0.398 nm
0.399 nm
0.402 nm
Which one of the following is demonstrated by the Compton Effect?
Time dilation
Length contraction
Electrons have wave properties
Electromagnetic radiation has particle properties
What is work function of a metal ?
A minimum amount of energy that is necessary to start photoelectric effect.
A maximum amount of energy that is necessary to start photoelectric effect.
amount of incident energy on the metal.
the energy of emitted electron.