Answer:
Te wavelength is 3.66 x 10^-11 m
Step-by-step explanation:
Question is
What is the de Broglie wavelength of an electron that strikes the back of the face of a TV screen at 1/15 the speed of light.
De Broglie's wavelength is gotten as
λ = h/mv
where
λ is the wavelength of the electron
h is the Planck's constant = 6.67 x 10^-34 J-s
m is the mass of an an electron = 9.109 x 10^-31 kg
v is the speed of the electron.
The speed of the electron is given as 1/15 of the speed of light
Speed of electron = 1/15 of 3 x 10^8 = 2.0 x 10^7 m/s
substituting values, we have
λ = (6.67 x 10^-34)/(9.109 x 10^-31)x(2.0 x 10^7) = 3.66 x 10^-11 m