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NEET UG PHYSICS MCQ: DUAL NATURE OF RADIATION AND MATTER

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Application +4 | -1

The work function of a substance is

3.0 \mathrm{~eV}.

The longest wavelength of light that can cause the emission of photoelectrons from this substance is approximately:

View answer and explanation

Correct option: A

414 \mathrm{~nm}

Option A (

414 \mathrm{~nm}

) is correct because it is calculated using the formula relating work function and wavelength:

\lambda = \frac{hc}{W_0}

.

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If the Broglie wavelengths associated with a proton and an

\alpha

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3 \to 2

transition of hydrogen atom falls on a metal surface to produce photoelectrons. These electrons are made to enter a magnetic field of

3 \times {10^{ - 4}}\,T.

If the radius of the largest circular path followed by these electrons is 10.0 mm, the work function of the metal is close to The shortest wavelength of

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