VITEEE 2024 | Dual Nature of Radiation Question 3 | Physics

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

2.5 eV

5 eV

4 eV

2 eV

VITEEE 2023

MCQ (Single Correct Answer)

-1

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?

$$45 \times 10^{10} \mathrm{~J}$$

$$45 \times 10^{11} \mathrm{~J}$$

$$45 \times 10^{12} \mathrm{~J}$$

$$45 \times 10^{13} \mathrm{~J}$$

VITEEE 2023

MCQ (Single Correct Answer)

-1

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

$$600 \mathop A\limits^o$$

$$0.636 \times 10^{-12} \mathrm{~m}$$

$$7 \mathop A\limits^o$$

$$0.63 \mathrm{~nm}$$

VITEEE 2022

MCQ (Single Correct Answer)

-1

In which of the following photoelectric effect is not observed?

Potassium

Rubidium

Magnesium

Cesium

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