Question

The mass of a golf ball is 45.9g. If it leaves the tee with a speed of 72.0 m/s, what is its corresponding wavelength?
Express your answer numerically in meters.

Would the correct answer be:

lambda=h/mv
lambda=6.626*10^-34/(45.9g)(72.0m/s)
lambda=2.00*10^-37 ???

Is the question this easy or is there some conversion that I am missing??

Answer 1

You are talking about the DeBroglie wavelength, a concept from quantum mechanics. It is equal to Planck's constant, h = 6.62*10^-34 J, divided by the momentum M v of the golf ball. You will find it to be very short compared to the size of the golf ball.

You have the right formula but you must express the mass in kg, not grams, since you are using SI units for h.

Answer 2

so...would I find the answer to be:

lambda=6.626*10^-34 J s/(0.0459kg)(72.0m/s)
answer= 2.00*10^-34

or should I have squared the 72.0m/s velocity?

Answer 3

2.0*10^-34 was correct. Thank you.

Answer 4

the answer is 1.95×10−34m. trust me, i got it wrong and it just told me the right answer !! :/

Answer 5

1.85×10−34m NOT 1.95×10−34m

Answer 6

2.0*10^-34 was correct.