WB JEE 2022 | Atoms and Nuclei Question 5 | Physics

WB JEE 2022

MCQ (Single Correct Answer)

-0.25

If the kinetic energies of an electron, an alpha particle and a proton having same de-Broglie wavelength are $${\varepsilon _1},{\varepsilon _2}$$ and $${\varepsilon _3}$$ respectively, then

$${\varepsilon _1} > {\varepsilon _3} > {\varepsilon _2}$$

$${\varepsilon _1} = {\varepsilon _3} = {\varepsilon _2}$$

$${\varepsilon _1} < {\varepsilon _3} < {\varepsilon _2}$$

$${\varepsilon _1} > {\varepsilon _2} > {\varepsilon _3}$$

WB JEE 2022

MCQ (Single Correct Answer)

-0.25

Suppose in a hypothetical world the angular momentum is quantized to be even integral multiples of $${h \over {2\pi }}$$. The largest possible wavelength emitted by hydrogen atoms in visible range in a world according to Bohr's model will be,

(Consider hc = 1242 Mev-fm)

153 nm

409 nm

121 nm

487 nm

WB JEE 2021

MCQ (Single Correct Answer)

-0.25

A 12.5 eV electron beam is used to bombard gaseous hydrogen at ground state. The energy level upto which the hydrogen atoms would be excited is

WB JEE 2021

MCQ (Single Correct Answer)

-0.25

Let r, v, E be the radius of orbit, speed of electron and total energy of electron respectively in H-atom. Which of the following quantities according to Bohr theory, is proportional to the quantum number n ?

$${r \over E}$$

$${r \over v}$$

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