Advertisements
Advertisements
प्रश्न
Choose the correct option.
The equation E = pc is valid ______.
पर्याय
For all sub-atomic particles
is valid for an electron but not for a photon
is valid for a photon but not for an electron
is valid for both an electron and a photon
Advertisements
उत्तर
The equation E = pc is valid for a photon but not for an electron.
Explanation:
The equation E = pc is the extension of Einstein’s mass-energy relation extended by Paul Dirac.
• The equation E = pc is valid when the rest mass of the particle is zero.
• The rest mass of the photon is zero, but the electron is not zero. Therefore, E = pc is not valid for the electron, but valid for the photon.
APPEARS IN
संबंधित प्रश्न
If NRed and NBlue are the numbers of photons emitted by the respective sources of equal power and equal dimensions in unit time, then ______.
The work function of a metal is 4.2 eV. Its threshold wavelength will be ______.
Ultraviolet radiation of 6.2 eV falls on an aluminum surface (work function 4.2 eV). The kinetic energy in joules of the fastest electron emitted is ______
What is mean by the dual nature of matter?
Calculate the stopping potential when the metal with the work function 0.6 eV is illuminated with the light of 2 eV.
In what year did Hertz perform experiments on the generation and detection of electromagnetic waves?
Which experiments led to important discoveries in atomic structure?
Where did a fluorescent glow appear during electric discharge through low-pressure gas?
What determined the colour of the fluorescent glow, and what colour was observed for soda glass?
Who discovered cathode rays in 1870?
Which British physicist confirmed that cathode rays consisted of fast-moving negatively charged particles?
What did Thomson apply across the discharge tube to determine the speed and specific charge of cathode ray particles?
What value is given for the speed of light?
What is the presently accepted value of the specific charge \[e/m\] for cathode ray particles?
What did the independence of \[e/m\] from cathode material and gas suggest?
Who named these particles electrons in 1897?
What did J. J. Thomson suggest about electrons in 1897?
Who performed the oil-drop experiment in 1913 for the precise measurement of the charge on an electron?
Which measured values could be used to determine the mass \[m\] of the electron?
