An electron of mass m and a photon have same energy E. The ratio of de-Broglie
An electron of mass m and a photon have same energy E. The ratio of de-Broglie wavelengths associated with them…
6 years ago
Dual Nature of Matter and Radiation
The energy of groundstate (n=1) of hydrogen level is -13.6 eV. The ionistation
The energy of groundstate (n=1) of hydrogen level is -13.6 eV. The ionistation potential of the hydrogen atom is Options…
6 years ago
A and B are two metals with threshold frequencies 1.8 x 10¹⁴ Hz and 2.2 x 10¹⁴ Hz.
A and B are two metals with threshold frequencies 1.8 x 10¹⁴ Hz and 2.2 x 10¹⁴ Hz. Two identical…
6 years ago
An electron is
An electron is Options (a) Hardon (b) Baryon (c) a nucleon (d) a lepton Correct Answer: a leptonExplanation:No explanation available.…
6 years ago
Hard X-rays for the study of fractures in bones should have a minimum wavelength
Hard X-rays for the study of fractures in bones should have a minimum wavelength of 10⁻¹¹ m. The accelerating voltage…
6 years ago
According to photon theory of light which of the following physical quantities,
According to photon theory of light which of the following physical quantities, associated with a photon, do not/does not change…
6 years ago
CO₂ laser uses
CO₂ laser uses Options (a) Microwaves (b) Infra red (c) Ultra violet (d) Visible light Correct Answer: Ultra violetExplanation:No explanation…
6 years ago
A photosensitive metallic surface has work function, hν₀. If photons of energy
A photosensitive metallic surface has work function, hν₀. If photons of energy 2hν₀ fall on this surface, the electrons come…
6 years ago
During production of cathode ray
During production of cathode ray Options (a) d.c. source is connected across cathode ray tube (b) a.c. source is connected…
6 years ago
Excitation energy of a hydrogen like ion, in its first excitation state, is 40.8 eV.
Excitation energy of a hydrogen like ion, in its first excitation state, is 40.8 eV. The energy needed to remove…
6 years ago