Physics Modern Physics questions from NEET UG 2004.
A nucleus represented by the symbol ${ }_{\mathrm{A}}^{\mathrm{A}} \mathrm{X}$ has:
According to Einstein's photoelectric equation, the graph between the kinetic energy of photoelectron ejected and the frequency of incident radiation is:
$M_P$ denotes the mass of a proton and $M_n$ that a neutron. A given nucleus, of binding energy $\mathrm{B}$, contains $Z$ protons and $N$ neutrons. The mass $M(N, Z)$ of the nucleus is given by $(c$ is the velocity of light):
Energy $E$ of a hydrogen atom with principal quantum number $n$ is given by $E=\frac{-13.6}{n^2} \mathrm{eV}$. The energy of a photon ejected when the electron jumps for $n=3$ state $n=2$ state of hydrogen is approximately
If a nuclear fusion process the masses of the fusing nuclei be $m_1$ and $m_2$ and the mass of the resultant nucleus be $m_3$, then:
In a $p-n$ junction photocell, the value of the photo electromotive force by monochromatic light is proportional to:
In semiconductors at a room temperature:
On the diodes shown in the following diagrams, which one is reverse biased:
The Bohr model of atoms:
The half life of a radium is about 1600 years. Of $100 \mathrm{~g}$ of radium existing now 25 g will remain unchanged after :-
The output of OR gate is 1 :
The peak voltage in the output of a halfwave diode rectifier fed with a sinusiodal signal without filter is $10 \mathrm{~V}$. The d.c. component of the output voltage is: