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NEET UG PHYSICS MCQ: DUAL NATURE OF RADIATION AND MATTER

1 Hard

1 of 1

Application +4 | -1

The maximum kinetic energy of photoelectron liberated from the surface of lithium (work function

=2.35 \mathrm{~eV}

) by electromagnetic radiation whose electric component varies with time as

E=a[1+\cos (2 \pi f_1 t)], \cos \left(2 \pi f_2 t\right)

where '

a

' is a constant,

f_1=3.6 \times 10^{15} \mathrm{~Hz}

and

f_2=1.2 \times 10^{15} \mathrm{~Hz}

is:
[Take:

h=6.6 \times 10^{-34} \mathrm{~J}-\mathrm{s}

]

View answer and explanation

Correct option: D

17.45 \mathrm{~eV}

Option D (

17.45 \text{ eV}

) is correct because it is the maximum kinetic energy calculated using the highest frequency component of the electromagnetic radiation and the work function of lithium.

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