NEET UG 2003 — Modern Physics

Barrier potential of a $p-n$ junction diode does not depend on:

A nuclear reaction given by ${ }_z \mathrm{X}^{\mathrm{A}} \rightarrow{ }_{z+1} \mathrm{Y}^{\mathrm{A}}+-1^{e^0}+\bar{v}$ represents:

Following diagram performs the logic function of: 

In which of the following systems will the radius of the first orbit $(n=1)$ be minimum?

If a full wave rectifier circuit is operating from $50 \mathrm{~Hz}$ mains, the fundamental frequency in the ripple will be:

The volume occupied by an atom is greater than the volume of the nucleus by a factor of about:

A sample of radioactive element has a mass of $10 \mathrm{~g}$ at an instant $t=0$. The approximate mass of this element in the sample after two mean lives is:

The mass number of a nucleus is:

Reverse bias applied to a junction diode

The mass of proton is $1.0073 u$ and that of neutron is $1.0087 u(u=$ atomic mass unit). The binding energy of ${ }_2^4 \mathrm{He}$ is: (Given helium nucleus mass $\approx 4.0015$ u)

Solar energy is mainly caused due to:

J.J. Thomson's cathode ray tube experiment demonstrated that:

A photoelectric cell is illuminated by a point source of light $1 \mathrm{~m}$ away. When the source is shifted to $2 \mathrm{~m}$ then: