Physics Test 13...

Fast neutrons can easily be slowed down by

Consider α particles, β particles and γ - rays each having an energy of 0.5 MeV. In increasing order of penetrating powers, the radiations are

The K_∝ X-ray emission line of tungsten occurs at λ  =0.021 nm. The energy difference between K and L levels in this atom is about

The electrical conductivity of a semiconductor increases when em radiation of wavelength shorter than 2480 nm is incident on it. The band gap (in eV) for the semiconductor is

The dominant mechanisms for motion of charge carriers in forward and reverse biased silicon p-n junctions are

As per Bohr model, the minimum energy (in eV) required to remove an electron from the ground state of doubly in ionized Li atom (Z=3) is

The circuit shown in the figure contains tow diodes each with a forward resistance of 50 ohms and with infinite backward resistance. If the battery voltage is 6V, the current through the 100 ohm resistance (inAmperes) is

Which of the following statement is not ture ?

A particle of mass M at rest decays into two particles of masses m1 and m2, having nonzero velocities. The ratio of the de Broglie wavelength of the particles λ ₁ / λ ₂ is