Recent content by Gunman

Thanks for explaining what the uncertainty principle was for.=) Just curious, how do you actually find the probability of the various positions it may land at? And the momemtum? If the photon is absorbed by the electron then how do you go about measuring the momentum and position of electron...

Homework Statement "If the photon has a short wavelength, and therefore a large momentum, the position can be measured accurately. But the photon will be scattered in a random direction, transferring a large and uncertain amount of momentum to the electron" Homework Equations I am unsure...

Yeah, got that part of the question. Thanks. =) But how do I go about doing the first part of the question?

Homework Statement An electron moves in a circular path in a vacuum under the influence of a magnetic field perpendicular to and into the paper.If there is another electron which moves with a higher speed in a circular path in the same B-field, state and explain how each of the following will...

Homework Statement I have attached the question. Homework Equations a)Potential Energy the electron gains = Kinetic energy it looses 1eV = 1.6 * 10^-19 Total P.E gained by the electron = 100 * 1.6 * 10^-19 = 1.6*10^-17 Therefore the kinetic energy it must possesses to reach the...

Ohh.Thanks blochwave! Understood why I was wrong. =)

Homework Statement A 100 kW generator supplies power at a p.d of 10kV through cables of total resistance 5 Ohms. Calculate the supply current and the power dissipated in the cables. Homework Equations P = IV V=IR Q=It The Attempt at a Solution Supply current: P=IV 100 kW =...

Homework Statement A standing wave is set up on a stretched string as shown. At which points will the osciallation be exactly in phase witht that at P? At which points will the oscillation be exactly out of phase with that at P? The points are on the horizontal line. Q at 2 P at 5 R...

Homework Statement A point source of sound emits energy equally in all directions at a constant rate and a person 8m from the source listens. After a while, the intensity of the source is halved. If the person wishes the sound to be seem as loud as before, how far should he be now...

Homework Statement A small source of sound radiates energy equally in all directions. At a particular frequency, the intensity of the sound 1.0 m from the source is 1.0 x 10-5m Wm-2, corresponding to an amplitude of oscillation of air molecules of 70milimetre. (Assume no energy loss) Find...

ohh. . thanks for the help. =)

Homework Statement I am blur about progressive waves. My notes state that a progressive wave is one which is characterised by the movement of the wave profile with transfer of energy and momentum, is classified as progressive wave. What does it mean by saying movement of wave profile? And...

Ohh. Okay thanks people. =) The replies helpes greatly.

Homework Statement How come it is said that attractive forces such as gravitational force have negative sign? And how come the sign is ignored in the case of gravitational force? And also, how come gravitational potential energy carries a negative sign? Is it because the displacement of the...

Thanks al. =) That solved the problem..=) haha