What is the de Broglie wavelength of a photon with a momentum $4.4 \times 10^{- 34} kg \cdot m / s$ ? Estimate $h$ as $6.63 \times 10^{- 34} J s$ and keep 2 significant figures.
a $1.6 m$
b $2.8 m$
c $2.3 m$
d $1.5 m$
e $2.6 m$

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Answer

$λ = 1.51 m$

Steps

Step 1 ： $λ = \frac{h}{p}$

Step 2 ： $λ = \frac{6.63 \times 10^{- 34} J s}{4.4 \times 10^{- 34} kg \cdot m / s}$

Step 3 ： $λ = 1.51 m$