Question

What will be de Broglie wavelength of an electron moving with a velocity of $$\displaystyle 1.2\times 10^{5}ms^{-1}$$?

A
6.068×109m
B
3.133×1037m
C
6.626×109m
D
6.018×107m

Solution

The correct option is B $$\displaystyle 6.068\times 10^{-9}m$$$$\displaystyle \lambda =\dfrac{h}{mv}$$                        $$\displaystyle \lambda =\dfrac{6.62\times 10^{-34}}{9.1\times 10^{-31}\times 1.2\times 10^{5}}$$$$\displaystyle \lambda =6.062\times 10^{-9}\: \: \: m$$option (A) is correct.Physics

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