Is` p= E/c `valid for electrons?

In Q.72,An electron and a photon possess the same de Broglie wavelength. If E e and E p h are, respectively, if the velocity of electron is 25% of the velocity of photon, then (E_e)/(E_(ph)) equals

Electron are accelerated through a potential difference V and protons are accelerated through a potential difference of 4 V. The de-Broglie wavelength are lamda_e and lamda_p for electrons and protons, respectively The ratio of lamda_e/lamda_p is given by ( given , m_e is mass of electron and m_p is mass of proton )

Draw correct curve for V vs 1/r : If = V Velocituy of electron in Bohr's orbit r= Radius of electron in Bohar's orbit P.E = Potential energy of electron in Bohr's orbit K.E. = Kinetic energy of electron in Bohr's orbit

The value of e/m for an electron is

If the total energy of an electron is -1.51 eV in hydrogen atom then find out K.E,P.E. , orbit radius and velocity of the electron in that orbit.

Determine the mass of an electron if for an electron e/m=1.759 xx 10^(8) Cg^(-1) and e=1.6021 xx 10^(-19)C

An electron field of moment p is placed in a uniform electric field E. Then, (i) the torque on the dipole is pxx E (ii) the potential energy of the system is p.E (iii) the resultant force on the dipole is zero.

In the derivation of P_1-P_2=rhogz it was asumed that the liquid is incompressible. Why will this equation not be stictly valid for a compressible liquid?

(a) A monoenergetic electron beam with electron speed of 5.20xx10^(6)ms^(-1) is subjected to a magnetic field of 1.30xx10^(-4)T , normal to the beam velocity. What is the radius of the circle traced by the beam, given e//m for electron equal 1.76xx10^(11)C.kg^(-1) . (b) Is the formula you employ in (a) valid for calculating radius of the path of 20 MeV electrons beam? If not, in what way is it modified!

In a certain region of space electric field E and magnetic field B are perpendicular to each other and an electron enters region perpendicular to the direction of B and E both and moves undeflected, then velocity of electron is (a) (|E|)/(|B|) (b) ExxB (c) (|B|)/(|E|) (d) E.B