What is the threshold frequency for sodium metal if a photon with frequency 6.66 x 10^14 sâ1 ejects an electron with 7.74 x 10^â20 j kinetic energy? will the photoelectric effect be observed if sodium is exposed to orange light?

The threshold frequency of sodium metal is and no photoelectric effect is seen.

Explanation:

To calculate the threshold frequency, we use the equation:

where,

= kinetic energy of the light =

h = Planck's constant =

= frequency of the photon =

= threshold frequency of the sodium metal = ?

Putting values in above equation, we get:

Photoelectric effect is defined as the emission of electrons when light hits the surface of metal. This effect will be seen only when the incident light fallen on the metal is greater than the threshold frequency of the metal.

We know that:

Frequency of orange light =

It is visible, that frequency of incident light is less than the threshold frequency. So, the photoelectric effect will not be seen.

Hence, the threshold frequency of sodium metal is and no photoelectric effect is seen.

question: ray weighs 100 kilograms, his wrestling partner, bobby, weighs 50 kilograms. if ray moves at 4 m s , how fast will bobby have to run at him to apply an equal amount of kinetic energy?

answer: 8 m/s he needs to run twice as fast to keep up so he has some work to do

explanation:   if the mass has units of kilograms and the velocity of meters per second, the kinetic energy has units of kilograms-meters squared per second squared.

question answered by

(jacemorris04)