Recent content by jamesjd

Would a gallium arsenide photodiode be sensitive to light from a gallium phopsphide LED?

thank you, are my calculations correct or am i missing something?

Homework Statement A slab of dielectric is now inserted between the plates, the battery still being connected. 7.5μC of additional charge flows from one plate, through the battery and onto the other plate. What is the dielectric constant of the dielectric material?Homework Equations A 1.0μF...

Homework Statement Homework Equations State Amperes Law. Show that the magnetic field at a distance R from a very long straight wire carrying a current I has magnitude μ I / (2 pi R) The Attempt at a Solution I really don't know :(

9.11x10^031kg Mass of electron 1.6x10^-19 electron + proton?

F = m*(v^2/r)?

so how would i get the acceleration to use F = ma?

Homework Statement In the Bohr Model of the Hydrogen Atom, a single Electron orbits a circle round a single stationary Proton. If the radius of the electron's orbit for its lowest energy state (the "ground state") is 5.3x10^-11m, find the the constant speed, v , of the orbiting electron...

2 kg/s ?

Ep = mgh for one kg lifted 50 meters? Ek = 1/2 mv^2 for one kg at 10m/s?

hmm it seems so simple but I'm struggling to grasp the concept. It takes 10Kg in 5 seconds then? Was any of my working correct?

Is it not 10m? erm is the calculation Mass = flow rate/ time? I'm still confused

Homework Statement A pump has to raise water from a depth of 50m and eject it at 10m/s. If the flow rate is 2 kg/s, what horsepower is needed. Homework Equations The Attempt at a Solution t = s/v = 5 seconds m = t/flow rate = 2.5kg E = mgh = 1250J P = E/t = 250W...