If a Hydrogen Atom and a Helium Atom Are Traveling

Multiple Choice

If a hydrogen atom and a helium atom are traveling at the same speed,

A) the wavelength of the hydrogen atom will be about 4 times longer than the wavelength of the helium atom.
B) the wavelength of the hydrogen atom will be about 2 times longer than the wavelength of the helium.
C) the wavelength of the hydrogen atom will be roughly equal to the wavelength of the helium atom.
D) the wavelength of the helium atom will be about 2 times longer than the wavelength of the hydrogen atom.
E) the wavelength of the helium atom will be about 4 times longer than the wavelength of the hydrogen atom.