Choose the way in which the earth's physical features affect people's activities. jobs they choose means of travel ways they spend their free time all of the above none of the above

Explain the doppler effect in terms of frequency, wavelength, and speed.

Which is not a source of noise pollution? a)airplanes b)acid rain c)machines d)cars

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.