(a) show that the skin depth in a poor conductor (σ< < ωϵ) is (2/σ)ϵ/μ−−−√ (independent of frequency). find the skin depth (in meters) for (pure) water. (use the static values of ϵ, μ, and σ; your answers will be valid, then, only at relatively low frequencies.)
(b) show that the skin depth in a good conductor (σ> > ωϵ) is λ/2π (where λ is the wavelenght in the conductor.) find the skin depth (in nanometers) for a typical metal (σ≈107(ω m)−1) in the visible range (ω≈1015 /s), assuming ϵ≈ϵ0 and μ≈μ0. why are metals opaque?
(c) show that in a good conductor the magnetic field lags the electric field by 45∘, and find the ratio of their amplitudes. for a numerical example, use the "typical metal" in part (b).

c. 7/3

step-by-step explanation:

a rational number is like pi- it is a repeating decimal.

a. is -1.8

b. 2.236068

c. 2.3333333333333333333

d.   is 3

i hope that ! =)

hi there!

your question asks at which segment does freezing occur.

since we're talking about water, the freezing point of water will be 32 degrees fahrenheit or below.

hope this ! ~

note: the given question is incomplete.

complete question is given below.

which is an example of kinetic energy?

a. the energy stored in ethanol  

b. a hockey puck sliding across the ice  

c. a compressed spring  

d. a ball sitting at the top of a ramp

solution: the kinetic energy is the energy posses by the virtue of the motion of the object.

in the given options, a, c and d are the example of potential energy because it is the energy posses by the virtue of the rest of the object. but option b has the kinetic energy as the object is in motion.

hence, a hockey puck sliding across the ice   is the apex example of kinetic energy.

so, the option (b) a hockey puck sliding across the ice   is the correct option.