Question

electrons are ejected from sodium metal by any light that has a wavelength shorter than 544 nm. what is the kinetic energy of an electron (in j) that is ejected from sodium by light with a wavelength of 253 nm?

Answer 1

The kinetic energy of an electron ejected from sodium by light with a wavelength of 253 nm can be calculated using the formula: Kinetic energy = Planck's constant x (speed of light / wavelength) - Work function

Step-by-step explanation:

The kinetic energy of an electron that is ejected from sodium by light with a wavelength of 253 nm can be calculated using the formula:

Kinetic energy = Planck's constant x (speed of light / wavelength) - Work function

First, convert the wavelength from nm to m. Then, use the given values of Planck's constant (h = 6.626 x 10^-34 J·s), the speed of light (c = 3.00 x 10^8 m/s), and the work function of sodium.

Substitute the values into the formula and calculate the kinetic energy.

By using the equation, the kinetic energy of the ejected electron is approximately 3.85 x 10^-19 J.