1
MHT CET 2022 11th August Evening Shift
MCQ (Single Correct Answer)
+1
-0

If the kinetic energy of a free electron doubles, it's de Broglie wavelength ($$\lambda$$) changes by a factor

A
$$\frac{1}{\sqrt{2}}$$
B
$$\frac{1}{2}$$
C
$$\sqrt{2}$$
D
$$2$$
2
MHT CET 2021 24th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

A light of wavelength '$$\lambda$$' and intensity '$$\mathrm{I}$$' falls on photosensitive material. If '$$\mathrm{N}$$' photo electrons are emitted, each with kinetic energy 'E', then

A
$$\mathrm{E} \propto \mathrm{I}, \mathrm{N} \propto \lambda$$
B
$$\mathrm{E} \propto \mathrm{I}, \mathrm{N} \propto \mathrm{I}$$
C
$$\mathrm{E} \propto \mathrm{I}, \mathrm{N} \propto \frac{1}{\lambda}$$
D
$$\mathrm{E} \propto \frac{1}{\lambda}, \mathrm{N} \propto \mathrm{I}$$
3
MHT CET 2021 24th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

In a photoelectric experiment, a graph of maximum kinetic energy $$(\mathrm{KE}_{\text {max }})$$ against the frequency of incident radiation (v) is plotted. If $$\mathrm{A}$$ and $$\mathrm{B}$$ are the intercepts on the $$\mathrm{X}$$ and $$\mathrm{Y}$$ axis respectively then the Planck's constant is given by

A
$$\mathrm{A}+\mathrm{B}$$
B
$$\frac{B}{A^{\prime}}$$
C
$$\mathrm{A} \times \mathrm{B}$$
D
$$\frac{\mathrm{A}}{\mathrm{B}}$$
4
MHT CET 2021 24th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

A photon has wavelength $$3 \mathrm{~nm}$$, then its momentum and energy respectively will be $$[\mathrm{h}=6.63 \times 10^{-34} \mathrm{Js}, \mathrm{c}=$$ velocity of light $$=3 \times 10^8 \mathrm{~m} / \mathrm{s}]$$

A
$$2.21 \times 10^{-43} \mathrm{~kg} \mathrm{~ms}^{-1} ; 6.63 \times 10^{-34} \mathrm{~J}$$
B
$$2.21 \times 10^{-34} \mathrm{~kg} \mathrm{~ms}^{-1} ; 6.63 \times 10^{-25} \mathrm{~J}$$
C
$$2.21 \times 10^{-25} \mathrm{~kg} \mathrm{~ms}^{-1} ; 6.63 \times 10^{-17} \mathrm{~J}$$
D
$$2.21 \times 10^{-16} \mathrm{~kg} \mathrm{~ms}^{-1} ; 6.63 \times 10^{-19} \mathrm{~J}$$
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