1
MCQ (Single Correct Answer)
A particle is dropped from a height $H$. The de-Broglie wavelength of the particle as a function of height is proportional to
A
H
B
$H^{1 / 2}$
C
$\mathrm{H}^0$
D
$H^{-1 / 2}$
2
MCQ (Single Correct Answer)
The wavelength of a photon needed to remove a proton from a nucleus which is bound to the nucleus with 1 MeV energy is nearly
A
1.2 nm
B
$1.2 \times 10^{-3} \mathrm{~nm}$
C
$1.2 \times 10^{-6} \mathrm{~nm}$
D
$1.2 \times 10 \mathrm{~nm}$
3
MCQ (Single Correct Answer)
Consider a beam of electrons (each electron with energy $E_0$ ) incident on a metal surface kept in an evacuated chamber. Then,
A
no electrons will be emitted as only photons can emit electrons
B
electrons can be emitted but all with an energy, $E_0$
C
electrons can be emitted with any energy, with a maximum of $E_0-\phi$ ( $\phi$ is the work function)
D
electrons can be emitted with any energy, with a maximum of $E_0$
4
MCQ (Single Correct Answer)
Consider figure given below. Suppose the voltage applied to $A$ is increased. The diffracted beam will have the maximum at a value of $\theta$ that
A
will be larger than the earlier value
B
will be the same as the earlier value
C
will be less than the earlier value
D
will depend on the target
5
MCQ (Single Correct Answer)
A proton, a neutron, an electron and an $\alpha$-particle have same energy. Then, their de-Broglie wavelengths compare as
A
$\lambda_p=\lambda_n>\lambda_e>\lambda_\alpha$
B
$\lambda_\alpha<\lambda_p=\lambda_n>\lambda_e$
C
$\lambda_e<\lambda_p=\lambda_n>\lambda_\alpha$
D
$\lambda_e=\lambda_p=\lambda_n=\lambda_\alpha$