PN10 · Quiz — Modern Physics: Atomic, Nuclear & Quantum

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Question 1

The de Broglie wavelength of an electron accelerated through potential V is:

Aλ = h/√(2meV)

Bλ = h/meV

Cλ = √(2meV)/h

Dλ = meV/h

Question 2

The Bohr model postulated that the angular momentum of electrons is quantised as:

AL = nh (n = 1,2,3...)

BL = nh/2π = nℏ

CL = n²h/2π

DL = h/n

Question 3

The binding energy per nucleon is maximum for iron-56 (~8.8 MeV/nucleon). This means:

AIron is the most radioactive element

BElements lighter than Fe can release energy

CIron has the smallest nucleus

DIron cannot undergo any nuclear reaction

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PN10 — Modern Physics: Atomic, Nuclear & Quantum — Quiz