JEE Main 2022 (Online) 25th June Morning Shift | Dual Nature of Radiation Question 28 | Physics

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JEE Main 2022 (Online) 25th June Morning Shift

MCQ (Single Correct Answer)

-1

Given below are two statements :

Statement I : Davisson-Germer experiment establishes the wave nature of electrons.

Statement II : If electrons have wave nature, they can interfere and show diffraction.

In the light of the above statements choose the correct answer from the option given below :

Both Statement I and Statement II are true.

Both Statement I and Statement II are false.

Statement I is true but Statement II is false.

Statement I is false but Statement II is true.

JEE Main 2022 (Online) 24th June Evening Shift

MCQ (Single Correct Answer)

-1

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 2022 (Online) 24th June Morning Shift

MCQ (Single Correct Answer)

-1

Nucleus A is having mass number 220 and its binding energy per nucleon is 5.6 MeV. It splits in two fragments 'B' and 'C' of mass numbers 105 and 115. The binding energy of nucleons in 'B' and 'C' is 6.4 MeV per nucleon. The energy Q released per fission will be :

0.8 MeV

275 MeV

220 MeV

176 MeV

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

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