What is the threshold frequency ν0 of cesium? Note that 1 eV (electron volt)=1.60×10−19 J. Express your answer numerically in hertz


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What is the threshold frequency ν0 of cesium? Note that 1 eV (electron volt)=1.60×10−19 J.
Express your answer numerically in hertz.

Concepts and reason
Calculate the threshold frequency by using the following equation.

image

Here, h is plank constant,image is threshold frequency, and E is ionization energy.
Calculate the threshold frequency by using the values of plank constant and the energy.

Fundamentals
Minimum amount of frequency that causes photo electric emission is called as threshold frequency.
Emission of electrons when light is incident on surface of a material is called as photo emission and this effect is called as photo electric effect.

Answer:
image
Minimum amount of energy required to remove an electron from an atom present in gaseous state is called as ionization energy.
image
Calculate the threshold frequency by substituting the values in image

Substitute the values in the formula.
image
image

The value of plank constant in the units of kilograms is image. Substitute image for h and image for E in the formula. Value of threshold frequency is obtained in the units of inverse of second. One inverse of second is equal to on hertz.

Threshold frequency of cesium atom is image.