9th me English ki NEEV Kaise Banae taaki Class 10 me 95+ Laa Paae

Class 9th English VVI Questions?| Set 1 | 9th English Complete Book Most Important Questions

In one model of the electron, the electron of mass me is thought to be a uniformly charged shell of radius R and total charge e, whose electrostatic energy E is equivalent to its mass me via Einstein's mass energy relation E = m_(e)c^(2) . In this model, R is approximately ( m_(e) = 9.1 xx 10^(-31) kg, c = 3 xx 10^(8), 1//4 pi epsilon_(0) = 9 xx 10^(9) "Farad" m^(-1) , magnitude of the electron charge = 1.6 xx 10^(-19)C ) –

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An electron in a hydrogen like atom is in an excited state3 . It has a total energy of -3 4 eV. Calculate : (a) The kinetic energy of electron . (b) The de-Broglie wavelength of electron . ( h = 6.6 xx 10^(023) , m_e = 9 .108 xx 10^(-31) kg)

Calculate the strength of the transverse magnetic field required to bend all photoelectorns within a circle of radius 50 cm, when light of wavelength 4000Å is incident on a barium emitter. Work function of barium is 2.5eV. Given, m_e=9.1xx10^(-31)kg, e=1.6xx10^(-19)C, h=6.6xx10^(-34)Js.

A monoenergetic (18 keV) electron beam initially in the horizontal direction is subjected to a horizontal magnetic field of 0.04 G normal to the initial direction. Estimate the up or down deflection of the beam over a distance of 30 cm (me = 9.11 × 10^(–31) kg) . [Note: Data in this exercise are so chosen that the answer will give you an idea of the effect of earth’s magnetic field on the motion of the electron beam from the electron gun to the screen in a TV set.]