1
COMEDK 2024 Morning Shift
+1
-0

The difference in energy levels of an electron at two excited levels is $$13.75 \mathrm{~eV}$$. If it makes a transition from the higher energy level to the lower energy level then what will be the wave length of the emitted radiation? [given $$h=6.6 \times 10^{-34} \mathrm{~m}^2 \mathrm{~kg} \mathrm{~s}^{-1} ; c=3 \times 10^8 \mathrm{~ms}^{-1} ; 1 \mathrm{~eV}=1.6 \times 10^{-19} \mathrm{~J}$$]

A
$$900 \mathrm{~nm}$$
B
$$9^0 \mathrm{~A}$$
C
$$9000 \mathrm{~nm}$$
D
$$900^{\circ} \mathrm{A}$$
2
COMEDK 2023 Morning Shift
+1
-0

When a certain metal surface is illuminated with light of frequency $$\nu$$, the stopping potential for photoelectric current is $$V_0$$. When the same surface is illuminated by light of frequency $$\frac{\nu}{2}$$, the stopping potential is $$\frac{V_0}{4}$$. The threshold frequency for photoelectric emission is

A
$$\frac{\nu}{6}$$
B
$$\frac{\nu}{3}$$
C
$$\frac{2\nu}{3}$$
D
$$\frac{4\nu}{3}$$
3
COMEDK 2023 Morning Shift
+1
-0

Let $$K_1$$ be the maximum kinetic energy of photoelectrons emitted by light of wavelength $$\lambda_1$$ and $$K_2$$ corresponding to wavelength $$\lambda_2$$. If $$\lambda_1=2 \lambda_2$$, then

A
$$2 K_1=K_2$$
B
$$K_1=2 K_2$$
C
$$K_1 < K_2 / 2$$
D
$$K_1>2 K_2$$
4
COMEDK 2023 Evening Shift
+1
-0

In the photoelectric experiment, the frequency of the incident radiation is doubled. What will be its effect on the photoelectric current?

A
Photoelectric current will be halved
B
Photoelectric current will be doubled
C
Photoelectric current will not change.
D
Photoelectric current will become zero
EXAM MAP
Medical
NEET