Homework #14

[206190205]

What would the speed of each particle be if it had the same wavelength as a photon of violet light ( wavelength=400.0 nm)?

I was able to get the first two answers, but I was unable to solve the third one which asks the electron (mass=9.109 x 10^-28 g) speed:

I divided planks constant by the mass multiplied by 400 x 10 ^-7 and got 0.181. What did I do wrong?

[Ayush Patel 3G]

λ=h/mv
4*10^-7=(6.626*10^-34)/(9.109*10^-31)(v)
v=(6.626*10^-34)/(9.109*10^-31*4*10^-7)
v=1818.531m/s

My guess is that you forgot to convert the mass of the electron into kilograms. Planck's constant is in units of Joules per second, and one Joule is one kilogram meter squared per second squared.

[Damian Valle Garcia 3I]

Hey! It looks like you may have not tooken in consideration the conversion factors. Make sure your final answer is in Joules per Second.