What is the energy of a photon that has the same wavelength as an electron having a kinetic energy of 15 ev?

Explanation:

The kinetic energy of an electron is given by the following equation:

  (1)

Where:

is the momentum of the electron

 is the mass of the electron

From (1) we can find :

   (2)

  (3)

Now, in order to find the wavelength of the electron   with this given kinetic energy (hence momentum), we will use the De Broglie wavelength equation:

   (4)

Where:

is the Planck constant

So, we will use the value of found in (3) for equation (4):

   (5)

We are told the wavelength of the photon   is the same as the wavelength of the electron:

   (6)

Therefore we will use this wavelength to find the energy of the photon using the following equation:

   (7)

Where  is the spped of light in vacuum

Finally:

  the unit of the measure =

explanation:

  the property that is quantified by the energy needed per of material to raise the temperature by one.

  si unit of energy = joule (j)

  si unit of temperature = kelvin (k)

  si unit of mass of material = kilogram (kg)

the property that is quantified by the energy needed per of material to raise the temperature by one is called specific heat.

the unit of specific heat is

the right answer is 0.3 meters per second