1
NEET 2023
MCQ (Single Correct Answer)
+4
-1
Change Language

The work functions of Caesium $$(\mathrm{Cs})$$, potassium $$(\mathrm{K})$$ and Sodium (Na) are $$2.14 ~\mathrm{eV}, 2.30 ~\mathrm{eV}$$ and $$2.75 ~\mathrm{eV}$$ respectively. If incident electromagnetic radiation has an incident energy of $$2.20 ~\mathrm{eV}$$, which of these photosensitive surfaces may emit photoelectrons?

A
Both Na and K
B
K only
C
Na only
D
Cs only
2
NEET 2023
MCQ (Single Correct Answer)
+4
-1
Change Language

The minimum wavelength of $$X$$-rays produced by an electron accelerated through a potential difference of $$V$$ volts is proportional to :

A
$$\frac{1}{V}$$
B
$$\frac{1}{\sqrt{V}}$$
C
$$V^{2}$$
D
$$\sqrt{V}$$
3
NEET 2023
MCQ (Single Correct Answer)
+4
-1
Change Language

A $$12 \mathrm{~V}, 60 \mathrm{~W}$$ lamp is connected to the secondary of a step down transformer, whose primary is connected to ac mains of $$220 \mathrm{~V}$$. Assuming the transformer to be ideal, what is the current in the primary winding ?

A
2.7 A
B
3.7 A
C
0.37 A
D
0.27 A
4
NEET 2023
MCQ (Single Correct Answer)
+4
-1
Change Language

Light travels a distance $$\mathrm{x}$$ in time $$t_{1}$$ in air and $$10 \mathrm{x}$$ in time $$t_{2}$$ in another denser medium. What is the critical angle for this medium?

A
$$\sin ^{-1}\left(\frac{10 \mathrm{t}_{2}}{\mathrm{t}_{1}}\right)$$
B
$$\sin ^{-1}\left(\frac{t_{1}}{10 t_{2}}\right)$$
C
$$\sin ^{-1}\left(\frac{10 t_{1}}{t_{2}}\right)$$
D
$$\sin ^{-1}\left(\frac{t_{2}}{t_{1}}\right)$$
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