Carolina is running at a rate of 5 m/s. Mr. Smith comes out and tells her to get fired up. She is scared. Over a period of 5 seconds, she increases her speed to a rate of
17.2 m/s. What is her rate of acceleration?

Explanation:

The de Broglie wavelength is given by the following formula:

  (1)

Where:

is the Planck constant

is the momentum of the atom, which is given by:

  (2)

Where:

is the mass of the electron

is the velocity of the electron (we are told it is 1/10 the speed of light )

This means equation (2) can be written as:

  (3)

Substituting (3) in (1):

   (4)

   (5)

Now, we only have to find :

    (6)

Finally:

>>> This is the de Broglie wavelength of an electron.