1well here's one p=√2mK hope this suffices.
and λ=h/mv a well known one this should do it.
In an experiment performed with electrons of energy 4eV, the wavelength of the electrons was measured by diffracting them from a crystal. The momentum of the electrons is now doubled. The wavelength of the electrons, after their momentum has been doubled, is nearly
1. 12.4
2. 3.1
3. 6.2
4. 3100
please provide hint
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