Modern Physics PYQ — Page 6

Which of the following phenomena does not explain by wave nature of light. A. reflection B. diffraction C. photoelectric effect D. interference E. polarization Choose the most appropriate answer from the options given below:

Which of the following nuclear fragments corresponding to nuclear fission between neutron $\left({ }_0^1 \mathrm{n}\right)$ and uranium isotope $\left({ }_{92}^{235} \mathrm{U}\right)$ is correct :

Which of the following circuits is reverse - biased ?

Which of the diode circuit shows correct biasing used for the measurement of dynamic resistance of p-n junction diode :

Which figure shows the correct variation of applied potential difference (V) with photoelectric current (I) at two different intensities of light $\left(\mathrm{I}_1 < \mathrm{I}_2\right)$ of same wavelengths :

When UV light of wavelength $300 \mathrm{~nm}$ is incident on the metal surface having work function $2.13 \mathrm{eV}$, electron emission takes place. The stopping potential is: (Given hc $=1240 \mathrm{eV} \mathrm{nm}$ )

When a metal surface is illuminated by light of wavelength $\lambda$, the stopping potential is $8V$. When the same surface is illuminated by light of wavelength $3\lambda$, stopping potential is $2V$. The threshold wavelength for this surface is :

When a hydrogen atom going from $n=2$ to $n=1$ emits a photon, its recoil speed is $\frac{x}{5}m{s}^{-1}$. Where $x=$_______. (Use: mass of hydrogen atom $=1.6\times {10}^{-27}\mathrm{kg}$, charge of electron $e=1.6\times {10}^{-19}C)$

UV light of $4.13 \mathrm{eV}$ is incident on a photosensitive metal surface having work function $3.13 \mathrm{eV}$. The maximum kinetic energy of ejected photoelectrons will be:

Two sources of light emit with a power of $200W$. The ratio of number of photons of visible light emitted by each source having wavelengths $300\mathrm{nm}$ and $500\mathrm{nm}$ respectively, will be :

The work function of a substance is $3.0\mathrm{eV}$. The longest wavelength of light that can cause the emission of photoelectrons from this substance is approximately:

The value of net resistance of the network as shown in the given figure is : 

The truth table of the given circuit diagram is : 

The truth table for this given circuit is: 

The threshold frequency of a metal with work function $6.63\mathrm{eV}$ is :

The shortest wavelength of the spectral lines in the Lyman series of hydrogen spectrum is $915 Ã…$. The longest wavelength of spectral lines in the Balmer series will be _____ $Ã…$.

The ratio of the shortest wavelength of Balmer series to the shortest wavelength of Lyman series for hydrogen atom is :

The ratio of the magnitude of the kinetic energy to the potential energy of an electron in the ${5}^{\text{th }}$ excited state of a hydrogen atom is :

The radius of third stationary orbit of electron for Bohr's atom is $R$. The radius of fourth stationary orbit will be:

The radius of a nucleus of mass number $64$ is $4.8$ fermi. Then the mass number of another nucleus having radius of $4$ fermi is $\frac{1000}{x},$ where $x$ is _________.

The output of the given circuit diagram is 

The output $(Y)$ of logic circuit given below is 0 only when : 

The output $\mathrm{Y}$ of following circuit for given inputs is : 

The minimum energy required by a hydrogen atom in ground state to emit radiation in Balmer series is nearly :