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Q1.
A positron has the same as an an electron (9×1031kg) but an opposite charge. When the two particles encounter each other, annihilation occurs and only gamma-rays are produced. How much energy is produced?
Q2.
Positron has same mass as that of an electron.

Q3.
Compute the ratio of the gravitational force and electrostatic force between an electron (mass = 9.1×1031 kg) and a proton (mass 1.7×1027kg). Given : e=1.6×1019C and G6.67×1011Nm2kg2
Q4.
An electron has urms value at 270C:
(Given me=9.108×1031kg).

Q5.
What wavelength must electromagnetic radiation have if a photon in the beam has the same momentum as an electron moving with a speed 1.1×105m/s(Planck's constant =6.6×1034J-s, rest mass of electron=9×1031kg?

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