# Recent content by spacetime

1. ### Electric Field in a Conductor

Suppose the electric field at a place is from left to right. Now when a conductor is put in the electric field, the electrons move to the left and hence there's a net negative charge on the left, and positive on the right. This creates a field which is from right to left, and hence opposite to...
2. ### Sound waves

When sound waves meet objects, they diffract around them. And that is why we can hear them around obstacles. For the person behind you in an open field, the sound waves when they come out of your mouth, diffract or 'spread' in all directions, because the mouth also is an aperture, and due to...
3. ### Conservation of energy

Solar energy is in fact not an entirely different form of energy, it is the light energy and heat energy that come directly from the sun, and the wind, water and chemical energy of the fuels that indirectly come from the sun that comprise of the collective "solar energy". So converting a form...
4. ### Diffraction vs refraction

Yes, I was wrong in what I said. Diffraction can indeed be explained using the photon picture, that is the particle nature of light. Actually, I was referring to the historical fact that diffracion could not be explained using the corpuscle picture, which could still have explained refraction by...
5. ### Diffraction vs refraction

Refraction is the "bending" of a ray when it meets an interface between media of two different optical densities (two different speeds in the media). Diffraction is the "spreading" of a wave, which may not be because of a change in the medium, it can occur even while the wave propagates in...
6. ### Identity for |sinx-siny|

Maybe this is what you're looking for... |sinx - siny| = 2 * |{sin(x-y)/2} * {cos(x+y)/2}| |cosx-cosy| = 2 * |{sin(x+y)/2} * {sin(x-y)/2}| Spacetime Physics
7. ### Arithmetic sequences

For the first problem, you can as well take the first term as 4173 and the common difference as 1. i.e. a= 4173 d = 1 The arithmetic sequence in this case would be 4173,4174,4175.....4207. spacetime Physics
8. ### Photons and mass

Photons are actually just light. Photon is a model, a short name for the fact that light has quanta of energy that sometimes show particle like beahvior on interaction with matter. They are not separate particles that happen to travel at the speed of light. Good observation, Mk...
9. ### A few Questions About Light.

Light gets absorbed in the atoms of the wall. Whatever be the material of the wall, there is a probability of photons getting absorbed by it, and the process happens quickly because of the fast speed of light. So the energy goes into increasing the thermal energy of the atoms of the wall. I...
10. ### What exactly is a photon

Photons are a model to describe the particle nature of light. They are energy quanta that light carries and since it was found in various experiments like photoelectric effect etc. that they can behave in a manner similar to 'normal' particles, the model was developed...
11. ### Question about Potential Energy.

No, the potential energy of a system may not always be only the gravitational energy and the elastic energy. The system may be under the influence of other forces like electric fields due to which it has other contributions to potential energy. http://www.geocities.com/physics_all"
12. ### The 2.82 factor

Thanks, I understand now it's just for sinusoids that 1.41 or \sqrt{2} is the factor.
13. ### Neutral Particle Acceleration

How are neutral elementary particles accelerated? Is it actually practical as of yet, or is there a way we can do so in the future?
14. ### The 2.82 factor

I know that the RMS values need to be multiplied be 1.41 to get peak values, but now we are doing an experiment with magnetic field, there is a device that produces the magnetic field and the manual says we are supposed to multiply RMS values (which this device shows) by 2.82 to get the peak...
15. ### Introducing LaTeX Math Typesetting

s \nabla \cross E=0 \nabla \cdot E =\frac {\rho}{\epsilon_0} abc