Which statement correctly represents the law of the conservation of mass? F. The number of atoms on the reactant side is less than the number of atoms on the product side.
G. The number of atoms on the reactant side equals the number of atoms of the product side.
H. The number of atoms on the reactant side is double the number of atoms on the product side.
J. The number of atoms on the reactants side is more than the number of atoms on the product side.

Suppose that an electromagnetic wave which is linearly polarized along the x−axis is propagating in vacuum along the z−axis. the wave is incident on a conductor which is placed at z > 0 region of the space. the conductor has conductivity σ, magnetic permeability µ and electric permittivity ε. (a) find the characteristic time for the free charge density which dissipates at the conductor. (b) write the maxwell equations and derive the wave equation for a plane wave propagating in a conductor. (c) find the attenuation distance at which the incident amplitude reduces to e ^−1 of its initial value. (d) find the electric and magnetic fields inside the conductor. 8 (e) find the power loss per area of the incident electromagnetic wave at the surface of conductor.

Give an example in which the electrical energy changes to light energy

Two trains leave a station at the same time, train a travels at a constant speed of 16 m/s. train b starts at 8.0 m/s but accelerates constantly at 1.0 m/s squared. after 10.0 seconds, which train has the greater speed?