1
VITEEE 2024
MCQ (Single Correct Answer)
+1
-0

A metal surface is illuminated with photons of energies $E_1=4 \mathrm{eV}$ and $E_2=2.5 \mathrm{eV}$ respectively. The ratio of maximum speeds of the photoelectrons in two cases is 2 . Work function of metal surface will be

A
2.5 eV
B
5 eV
C
4 eV
D
2 eV
2
VITEEE 2023
MCQ (Single Correct Answer)
+1
-0

When $${ }_{92} \mathrm{U}^{235}$$ undergoes fission, $$0.1 \%$$ of its original mass is changed into energy. How much energy is released if $$5 \mathrm{Kg}$$ of $${ }_{92} \mathrm{U}^{235}$$ undergoes fission?

A
$$45 \times 10^{10} \mathrm{~J}$$
B
$$45 \times 10^{11} \mathrm{~J}$$
C
$$45 \times 10^{12} \mathrm{~J}$$
D
$$45 \times 10^{13} \mathrm{~J}$$
3
VITEEE 2023
MCQ (Single Correct Answer)
+1
-0

The de-Broglie wavelength of a proton $$\left(m=1.67 \times 10^{-27} \mathrm{~kg}\right)$$ acclerated through a potential difference of $$2 \mathrm{~kV}$$ is

A
$$600 \mathop A\limits^o$$
B
$$0.636 \times 10^{-12} \mathrm{~m}$$
C
$$7 \mathop A\limits^o$$
D
$$0.63 \mathrm{~nm}$$
4
VITEEE 2022
MCQ (Single Correct Answer)
+1
-0

In which of the following photoelectric effect is not observed?

A
Potassium
B
Rubidium
C
Magnesium
D
Cesium
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