The wave length of particle A in motion is 5 x 10^ -8 m. Calculate wave length of B if its momentum is 1/2 ofA

Question

The wave length of particle A in motion is 5 x 10^ -8 m. Calculate wave length of B if its momentum is 1/2 ofA

Answer 1

lambdaA = h/p   , lambdaB = h/p/2

or, lambdaB /lambdaA = 2

or, lambdaB = 2 x lambdaA = 2 x 5 x 10^ -8 = 10^-7m.

Answer 2

You use the DeBroglie equation.

Where wavelength = Planck's constant / Momentum.

Planck's constant is 6.63 x 10^-34

Yay physics!