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NEET UG PHYSICS MCQ: DUAL NATURE OF RADIATION AND MATTER

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Understanding +4 | -1

A beam of light of wavelength

\lambda

and with illumination

L

falls on a clean surface of sodium. If

N

photoelectrons are emitted each with kinetic energy

E,

then

View answer and explanation

Correct option: B

N \propto L

and

E \propto \frac{1}{\lambda }

Option B (

N \propto L

and

E \propto \frac{1}{\lambda }

) is correct because the number of photoelectrons emitted is proportional to the light intensity, and the kinetic energy of the photoelectrons is inversely proportional to the wavelength of light.

More Questions from DUAL NATURE OF RADIATION AND MATTER

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If the Broglie wavelengths associated with a proton and an

\alpha

- particle are equal, then the ratio of velocities of the proton and the

\alpha

- particle will be: If the wavelength of incident light changes from 400 nm to 300 nm, the stopping potential for photoelectrons emitted from a surface becomes approximately In photo-electric effect, when graph is plotted for stopping potential versus frequency of incident light, for different metals, then: The radiation corresponding to

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

X

-rays emitted from an

X

-ray tube depends on the Planck’s constant has the dimensions of