Consider an electron (mass of 9.10939x10-31 kg) traveling at 1/40th the speed of light. Which of the following statements is correct?
The wavelength of the e- is 5.22 x 10-9 m and this has practical significance.
The wavelength of the e- is 5.22 x 10-9 m and this does not have practical significance.
The wavelength of the e- is 1.21 x 10-10 nm and this has practical significance.
The wavelength of the e- is 9.70 x 10-11 m and this has practical significance.
The wavelength of the e- is 9.70 x 10-11 m and this does not have practical significance.

Question

Consider an electron (mass of 9.10939x10-31 kg) traveling at 1/40th the speed of light.  Which of the following statements is correct?
The wavelength of the e- is 5.22 x 10-9 m and this has practical significance.
The wavelength of the e- is 5.22 x 10-9 m and this does not have practical significance.
The wavelength of the e- is 1.21 x 10-10 nm and this has practical significance.
The wavelength of the e- is 9.70 x 10-11 m and this has practical significance.
The wavelength of the e- is 9.70 x 10-11 m and this does not have practical significance.