JEE Main 2022 (Online) 25th June Morning Shift | Dual Nature of Radiation Question 70 | Physics

The light of two different frequencies whose photons have energies 3.8 eV and 1.4 eV respectively, illuminate a metallic surface whose work function is 0.6 eV successively. The ratio of maximum speeds of emitted electrons for the two frequencies respectively will be :

1 : 1

2 : 1

4 : 1

1 : 4

JEE Main 2021 (Online) 1st September Evening Shift

MCQ (Single Correct Answer)

-1

The temperature of an ideal gas in 3-dimensions is 300 K. The corresponding de-Broglie wavelength of the electron approximately at 300 K, is :

[m_e = mass of electron = 9 $$\times$$ 10^$$-$$31 kg, h = Planck constant = 6.6 $$\times$$ 6.6 $$\times$$ 10^$$-$$34 Js, k_B = Boltzmann constant = 1.38 $$\times$$ 10^$$-$$23 JK^$$-$$1]

6.26 nm

8.46 nm

2.26 nm

3.25 nm

JEE Main 2021 (Online) 31st August Evening Shift

MCQ (Single Correct Answer)

-1

A free electron of 2.6 eV energy collides with a H⁺ ion. This results in the formation of a hydrogen atom in the first excited state and a photon is released. Find the frequency of the emitted photon. (h = 6.6 $$\times$$ 10^$$-$$34 Js)

1.45 $$\times$$ 10¹⁶ MHz

0.19 $$\times$$ 10¹⁵ MHz

1.45 $$\times$$ 10⁹ MHz

9.0 $$\times$$ 10²⁷ MHz

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