Physics: Topic-wise Test- 6 - NEET MCQ

A proton and an electron are acceleration by the same potential difference Let λ _e and   λ _p denote the de Broglie wavelengths of the electron and the proton respectively

Ionization energy of a hydrogen-like ion A is greater than that of another hydrogen-like ion B. Let r,u,E and L represent the radius of the orbit,speed of the electron, energy of the atom and orbital angular momentum of the electron respectively. In ground state

When an impurity is doped into an intrinsic semiconductor,the cunductivity of the semiconductor

Two identical p-n junction may be connected in series with a battery in three ways (figure). The potential difference across the two p-n junctions are equal is: 

The mass number of a nucleus is

Two protons are kept at a separation of 10 nm. Let F_n and  F _e be the nuclear force and the electromagnetic force between them.

Ten grams of ⁵⁷Co kept in an open containg beta-decays with a half-life of 270 days. The weight of the material inside the container after 540 days will be very nearly

If elements with principle quantum number n>4 were not allowed in nature, the number of possible elements would be

Consider the spectral line resulting from the transition n = 2  → n = 1 in the atoms and ions given below. The shortest wave length is produced by

The equation

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

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