Question

what is the wavelength associated with the proton moving at a speed of 40 m/s​

Answer 1

• Velocity=v=40m/s
• Wavelength=$\lambda$
• Mass of proton=1.67×10^{-27}Kg

We know

$\boxed{\sf \lambda=\dfrac{h}{mV}}$

$\\ \sf\longmapsto \lambda=\dfrac{6.626\times 10^{-34}}{1.67\times 10^{-27}\times 40}$

$\\ \sf\longmapsto \lambda=158.7\times 10^{-7}m$

$\\ \sf\longmapsto \lambda=15.8\times 10^{-6}m$

$\\ \sf\longmapsto \lambda=15.8\mu m$