1
VITEEE 2025
MCQ (Single Correct Answer)
+4
-1

A flask contains argon and chlorine in the ratio of $2: 1$ by mass, the temperature of mixture is $27^{\circ} \mathrm{C}$, the ratio of root mean square ( $U_{\mathrm{rms}}$ ) of the molecule of two gases (Given, Atomic mass of argon $=39.9 v$, Molecular mass of chlorine $=70.9 u$ )

A

$\frac{2}{3}$

B

0.1

C

$\frac{10}{3}$

D

1.33

2
VITEEE 2025
MCQ (Single Correct Answer)
+4
-1

When a beam of 10.6 eV photons of intensity $2.0 \mathrm{~W} / \mathrm{m}^2$ falls on a platinum surface of area $1.0 \times 10^{-4} \mathrm{~m}^2$ and work function $5.6 \mathrm{eV} .0 .53 \%$ of the incident photons eject photoelectrons. The number of photoelectrons emitted per second is

A

$625 \times 10^{11}$

B

$425 \times 10^{10}$

C

$625 \times 10^{10}$

D

$425 \times 10^{11}$

3
VITEEE 2025
MCQ (Single Correct Answer)
+4
-1

If the magnetic field in plane electromagnetic wave is

$$ \mathbf{B}=3 \times 10^{-8} \sin \left(1.6 \times 10^3 x+48 \times 10^{10} t\right) \hat{\mathbf{j}} \mathrm{T}, $$

then find the expression of electric field?

A

$60 \sin \left(1.6 \times 10^3 x+48 \times 10^{10} t\right) \hat{\mathbf{k}} \mathrm{V} / \mathrm{m}$

B

$3 \times 10^{-8} \sin \left(1.6 \times 10^3 x+48 \times 10^{10} t\right) \hat{\mathrm{i}} \mathrm{V} / \mathrm{m}$

C

$9 \sin \left(1.6 \times 10^3 x+48 \times 10^{10} t\right) \hat{\mathbf{k}} \mathrm{V} / \mathrm{m}$

D

$3 \times 10^{-8} \sin \left(1.6 \times 10^3 x+48 \times 10^{10} t\right) \hat{\mathbf{j}} \mathrm{V} / \mathrm{m}$

4
VITEEE 2025
MCQ (Single Correct Answer)
+4
-1

A laser beam of cross-sectional area $5 \mathrm{~mm}^2$ is 30 mW . Find the magnitude of maximum electric field in this electromagnetic wave.

A

$2.1 \mathrm{kV} / \mathrm{m}$

B

$1.4 \mathrm{kV} / \mathrm{m}$

C

$2 \mathrm{kV} / \mathrm{m}$

D

$0.5 \mathrm{kV} / \mathrm{m}$

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