If a hydrogen atom and a helium atom have the same kinetic energy,
◦ the wavelength of the hydrogen atom will be about 4 times longer than the wavelength of the helium atom.
◦ the wavelength of the hydrogen atom will be about 2 times longer than the wavelength of the helium.
◦ the wavelength of the hydrogen atom will be roughly equal to the wavelength of the helium atom.
◦ the wavelength of the helium atom will be about 2 times longer than the wavelength of the hydrogen atom.
◦ the wavelength of the helium atom will be about 4 times longer than the wavelength of the hydrogen atom.