Electrons are emitted with zero velocity from a metal surface when it is exposed to radiation of wavelength 6800 Å. Calculate the threshold frequency (v₀) and the work function (W₀) of the metal.

Solution

Wavelength of radiation (λ) = 6800 Å
= 6800 X 10^-10m
Now, threshold frequency $straight v subscript 0 space equals space straight c over straight lambda$
$space space space equals space fraction numerator 3 space cross times space 10 to the power of 8 ms to the power of negative 1 end exponent over denominator 6800 space cross times 10 to the power of negative 10 end exponent straight m end fraction space space space equals 4.41 space cross times space 10 to the power of 14 straight s to the power of negative 1 end exponent$
Also work function (W₀) = hv₀= (6.626 x 10^-34 Js) x (4.41 x 10¹⁴ s^-1)
= 2.92 x 10^-19 J

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Structure Of Atom

Electrons are emitted with zero velocity from a metal surface when it is exposed to radiation of wavelength 6800 Å. Calculate the threshold frequency (v₀) and the work function (W₀) of the metal.

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Structure Of Atom

Electrons are emitted with zero velocity from a metal surface when it is exposed to radiation of wavelength 6800 Å. Calculate the threshold frequency (v0) and the work function (W0) of the metal.

Some More Questions From Structure of Atom Chapter

What is a proton?

Who discovered neutron?

What is a neutron?

What is the name of the remaining part of atom except outer orbit?

Name the particles which determine the mass of an element.

What are α-particles?

Why were neutrons discovered very late?

What are the fundamental particles present in a neutral atom having atomic number greater than 1?

Do protons and neutrons have identical mass?

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

Electrons are emitted with zero velocity from a metal surface when it is exposed to radiation of wavelength 6800 Å. Calculate the threshold frequency (v₀) and the work function (W₀) of the metal.