Top answers

How does the photoelectric effect (gold leaf experiment) demonstrate the particle nature of light?

A certain amount of energy is required to eject an electron from a metal surface. The gold leaf experiment shows that only light above a certain threshold frequency is able to eject electrons. If the frequen...
MC
Answered by Molly C. • Physics tutor
13675 Views

A student has a mass of 80kg. How much would the student weigh on the surface of the Moon?

The Moon has a mass, M M = 7.35 x 10 22 kgThe Moon has a radius, R M = 1.74 x 10m We want to determine the gravitational constant for the Moon's surface to then calculate the weight of the student using Newt...
GB
Answered by Guy B. • Physics tutor
3239 Views

Electrons moving in a beam have the same de Broglie wavelength as protons in a separate beam moving at a speed of 2.8 × 10^4 m/s . What is the speed of the electrons?

de Broglie wavelength formula: λ = h/mv, whereλ = wavelength,h = Planck's Constant = 6.626 x 10 -34 Js,m = mass of object,v = object's velocity, Mass of proton m p = 1.6726219 × 10 -27 kg,Velocity of proton ...
HA
Answered by Haider A. • Physics tutor
10552 Views

The mass of the Earth is 6.0x10^24 kg and its radius is 6.4x10^6m, calculate the orbital speed of the moon around the earth, the orbit of the moon is a circle of approximate radius of 60R where R is the radius of the earth and a mass m.

M=6.0x10 24 kg create info list of information given in the question converting all values to SI units R=6.4x10 6 mF=GMm/r 2 F=mv 2 /r write down any necessary equations Force due to the gravitational attrac...
ED
Answered by Emma D. • Physics tutor
8513 Views

A light is shone through a diffraction grating of slit spacing 4.5x10^5 lines per metre. The incident wavelength is 650nm. Find the angle produced by the incident light and the 2nd order maximum.

In the question you are given the slit spacing of the diffraction grate. To find the fringe spacing of this grate you can use d=1/N where N is the slits per metre. In this question this would be 1/4.5x10^5 =...
SC
Answered by Sarah C. • Physics tutor
5737 Views