The relation between amplification factor (μ), plate resistance (rp) and mutual conductance (gm) of a triode value is given by :
none of these
A light of wavelength 5000 Å falls on a sensitive plate with photoelectric work function 1.90 eV. The kinetic energy of the emitted photoelectrons will be :
(Given, h = 6.62 × 10-34 Joule second)
0.1 eV
2 eV
0.581 eV
1.581
Continuous emission spectrum, emitted wavelength about spectrum, the range depends upon:
temperature of the source
material of the source
surface area of the source
all of the above
The emission electron is possible by
photoelectric effect
thermionic effect
both (a) and (b)
none of the above
An electron and a proton are possessing the same amount of kinetic energies. The de-Broglie wavelength is greater for :
electron
proton
both same
none of these
A.
electron
de-Broglie wavelength
Where h = Planck's constant
Electron and proton have the same kinetic energy,
So,
Mass of electron is less than that of a proton, so electron will have greater wavelength.
In a mean life of radioactive sample :
about of substance disintegrates
about of substance disintegrates
about 90% of the substance disintegrates
almost all the substance disintegrates
If the half-life of any sample of a radioactive substance is 4 days, then the fraction of the sample will remain undecayed after 2 days, will be
On applying a reverse bias to a junction diode, it:
lowers the potential barrier
raises the potential barrier
increases the majority carrier current
increases the minority carrier current
For the stability of any nucleus:
binding energy per nucleon will be more
binding energy per nucleon will be less
no. of electrons will be more
none of these