What is the de Broglie wavelength of a dust particle that has a mass of 1e-10 kg and a velocity of 0.05m/s?
From the question asked, we need to identify the key bits of information.
Firstly, we are asked to find the de Broglie wavelength, so we write down the de Broglie relation:
lambda = h/p
In this equation we want to find the wavelength lambda, and we know h is Planck's constant, h = 6.63e-34 Js. So the remaining term we need to determine is p, the momentum.
In order to find the momentum, we use the relation p=m*v, using the mass and velocity given in the question.
We can now calculate the wavelength by plugging p into the de Broglie formula.
lambda = 1.33e-22 m
JH
Related Physics A Level answers
All answers ▸The energy of a photon is 1.5MeV. Calculate the frequency associated with this photon energy and state an appropriate unit in your answer.
The tip of each prong of a tuning fork emitting a note of 320Hz vibrates in SHM with an amplitude of 0.50mm. What is the speed of each tip when its displacement is zero?
A water jet starts at a point X and reaches its maximum height at a point Y. Air resistance has a negligible effect on the motion of the water jet. (i) State the direction of the force acting on the jet at Y. (1 mark)
Compare and contrast geostationary and low polar orbits.