[" ELEMENTARY PARTICALS "],[" A photon of energy "1.12" Mev splits into "],[" electron positron pair.The velocity of "],[" electron is (Neglect relativistic correction) "],[" 1) "3times10^(8)ms^(-1)quad " 2) "1.32times10^(8)ms^(-1)],[" 3) "6times10^(8)ms^(-1)quad " 4) "9times10^(8)ms^(-1)]

6. ^(*) The current in a metal wire of cross-sectional area 10^(-6)m^(2) is 1.6A .If the free electron density of the metal is 8times 10^(28)m^(-3) then the drift speed of electrons is (A) 1.25times10^(-3)ms^(-1) (B) 2times10^(-3)ms^(-1) (C) 1.25times10^(-4)ms^(-1) (D) 2times10^(-4)ms^(-1)

A first order reaction has a half life period of 69.3 s .the rate of reaction when the concentration of reactant is 0.1M (A) 10^(-4)Ms^(-1) (B) 10^(-3)Ms^(-1) (C) 10^(-1)Ms^(-1) (D) 6.93times10^(-1)Ms^(-1)

6. ^(*) The current in a metal wire of cross-sectional area 10^(-6)m^(2) is 1.6A .If the free electron density of the metal is 8times x^(2) x 10^(28)m^(-3) then the drift speed of electrons is (A) 1.25times10^(-3)ms^(-1) (B) 2times10^(-3)ms^(-1) (C) 1.25times10^(-4)ms^(-1) (D) 2times10^(-4)ms^(-1)

If the velocity of electron in Bohr's first orbit is 2.19 xx 10^(6)ms^(-1) . The de-Broglie's wavelength is

What will be de Broglie's wavelength of an electron moving with a velocity of 1.2 xx 10^(5) ms^(-1) ?

What will be de Broglie's wavelength of an electron moving with a velocity of 1.2 xx 10^(5) ms^(-1) ?

Calculate the energy of radiation emitted for the electronic transition from infinity to ground state for hydrogen atom. Given c = 3xx10^(8)" ms"^(-1), R_(H) = 1.09678 xx 10^(7) m^(-1), h = 6.6256 xx 10^(-34)" J s"^(-1)