Physics Modern Physics questions from NEET UG 2015.
A nucleus of uranium decays at rest into nuclei of thorium and helium. Then:
A photoelectric surface is illuminated successively by monochromatic light of wavelength $\lambda$ and $\frac{\lambda }{2}$. If the maximum kinetic energy of the emitted photoelectrons in the second case is 3 times that in the first case, the work function of the surface of the material is: ($h$ = Planck's constant, $c$ = speed of light)
Consider third orbit of ${\mathrm{He}}^{+}$ (helium), using non-relativistic approach, the speed of electron in this orbit will be given constant $K{\text{=9×10}}^{\text{9}}$, $Z=2$ and $h$ (Planck's Constant)$\text{= 6}\text{.6 }\times {\text{ 10}}^{-34}\text{ J s}$
If in a p-n junction, a square input signal of $10V$ is applied as shown, then the output across ${R}_{L}$ will be 
If radius of the $A1327l$ nucleus is taken to be ${R}_{Al}$ then the radius of $Te53125$ nucleus is nearly
In the given figure, a diode $D$ is connected to an external resistance $R=100\Omega$ and an $emf$ of $3.5V$ If the barrier potential developed across the diode is $0.5V$, the current in the circuit will be 
In the spectrum of hydrogen, the ratio of the longest wavelength in the Lyman series to the longest wavelength in the Balmer series is:
Light of wavelength $500\mathrm{nm}$ is incident on a metal with work function $2.28\mathrm{eV}$. The de Broglie wavelength of the emitted electron is:
The input signal is given to a CE amplifier having a voltage gain of $150$ is ${V}_{i}=2\mathrm{cos}(15t+\frac{\pi }{3})$. The corresponding output signal will be:
When a certain metallic surface is illuminated with monochromatic light of wavelength $\lambda ,$ the stopping potential for photoelectric current is $3{V}_{0}$ and when the same surface is illuminated with light of wavelength $2\lambda ,$ the stopping potential is ${V}_{0}.$ The threshold wavelength of this surface for photoelectric effect is
Which logic gate is represented by the following combination of logic gates? 
Which of the following figures represent the variation of particle momentum and the associated de-Broglie wavelength?