PROBLEM
Find the de Broglie wavelength of a 144 g ball moving at 33.87 m/s. Provide the answer to 3 significant figures.
STEP 1
Assumptions1. The mass of the ball is 144 g
. The velocity of the ball is 33.87 m/s
3. The ball can be modeled as a single particle4. We use the de Broglie wavelength formula λ=mvh, where h is Planck's constant, m is the mass of the particle, and v is the velocity of the particle5. Planck's constant h=6.62607015×10−34 mkg/s
STEP 2
First, we need to convert the mass of the ball from grams to kilograms, since the units of Planck's constant are in terms of kilograms.
m=144 g=144×10− kg
STEP 3
Now, we can plug in the values for Planck's constant, the mass, and the velocity into the de Broglie wavelength formula.
λ=mvh=144×10−3 kg×33.87 m/s6.62607015×10−34 m2kg/s
SOLUTION
Calculate the de Broglie wavelength.
λ=144×10−3 kg×33.87 m/s6.62607015×10−34 m2kg/s=1.37×10−34 mThe de Broglie wavelength of the ball is 1.37×10−34 m to3 significant figures.
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