A tree leaf appears to be green. Which statement explains why the leaf isn't a blackbody radiator? A. The leaf emits light but does not reflect it.
B. The leaf emits only blue and yellow light.
C. The leaf reflects light and does not emit it.
D. The leaf does not change temperature when it reflects light.

In raising a 6200-n piano with a pulley system, the movers note that, for every 2.2 m of rope pulled down, the piano rises 0.12 m . ideally, find the force required to lift the piano.

What is tan(61)? а. 1.80 b. 0.49 c. 0.61 d. 0.87

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.