JEE Main 2024 (Online) 1st February Evening Shift | Dual Nature of Radiation Question 14 | Physics

Conductivity of a photodiode starts changing only if the wavelength of incident light is less than $660 \mathrm{~nm}$. The band gap of photodiode is found to be $\left(\frac{\mathrm{X}}{8}\right) \mathrm{eV}$. The value of $\mathrm{X}$ is :

(Given, $\mathrm{h}=6.6 \times 10^{-34} \mathrm{Js}, \mathrm{e}=1.6 \times 10^{-19} \mathrm{C}$ )

JEE Main 2024 (Online) 1st February Morning Shift

MCQ (Single Correct Answer)

-1

The de Broglie wavelengths of a proton and an $\alpha$ particle are $\lambda$ and $2 \lambda$ respectively. The ratio of the velocities of proton and $\alpha$ particle will be :

$8: 1$

$1: 2$

$1: 8$

$4: 1$

JEE Main 2024 (Online) 31st January Evening Shift

MCQ (Single Correct Answer)

-1

In a photoelectric effect experiment a light of frequency 1.5 times the threshold frequency is made to fall on the surface of photosensitive material. Now if the frequency is halved and intensity is doubled, the number of photo electrons emitted will be:

doubled

halved

Zero

quadrupled

JEE Main 2024 (Online) 31st January Morning Shift

MCQ (Single Correct Answer)

-1

When a metal surface is illuminated by light of wavelength $$\lambda$$, the stopping potential is $$8 \mathrm{~V}$$. When the same surface is illuminated by light of wavelength $$3 \lambda$$, stopping potential is $$2 \mathrm{~V}$$. The threshold wavelength for this surface is:

3$$\lambda$$

9$$\lambda$$

5$$\lambda$$

4.5$$\lambda$$

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