Question

When a beam of photons of a particular energy was incident on a surface of a particular pure metal having work function =
(40 eV). some emitted photoelectrons had stopping potential equal to 22 V, some had 12 V and rest had lower values.
Calculate the wavelength of incident photons assuming that at least one photoelectron is ejected with maximum possible
kinetic energy​

Answer 1

Answer:

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Answer 2

Answer:

200 Angstrom.

Explanation:

Given,

When a beam of photons of a particular energy was incident on a surface of a particular pure metal having work function = (40 eV).

To Find,

The wavelength of incident photons assuming that at least one photoelectron is ejected with maximum possible kinetic energy​.

Concept:

Using Equation of the Einstein's Photoelectric Theory.

$K_{max}$ = hv - ∅

⇒ $eV_{max} = \frac{hC}{lambda}$ - ∅

⇒ $\frac{hC}{lambda} = eV_{max}$ + ∅

⇒ $\frac{hC}{lambda} = 22 +40 (in eV)$

⇒ $\frac{12400}{lambda (in angstrom)} = 62$

⇒ lambda = $\frac{12400}{62}$

                 = 200 Angstrom

Hence, the answer is 200 Angstrom.

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