What must be the relative speed between source and receiver if the wavelength of an EM wave as measured by the receiver is twice the wavelength as measured by the source? Are source and observer moving closer together or farther apart?

Write the following sentence, inserting quotation marks (and commas) where necessary. If the sentence is correct, write Correct.

Another time Ruth was reported as saying All I can tell 'em is I pick a good one and sock it. I get back to the dugout and they ask me what it was I hit and I tell 'em I don't know except it looked good.

(II) A spherically spreading EM wave comes from a $1500-\mathrm{W}$ source. At a distance of $5.0 \mathrm{~m}$, what is the intensity, and what is the rms value of the electric field?

Suppose a $25~\mathrm{~kW}$ radio station emits EM waves uniformly in all directions. What is the rms voltage induced in a $1.0 \mathrm{~m}$ long vertical car antenna $50 \mathrm{~km}$ away

Suppose a 35-kW radio station emits EM waves uniformly in all directions.(a) How much energy per second crosses a $1.0-\mathrm{m}^2$ area $1.0 \mathrm{~km}$ from the transmitting antenna?

Use the context of the sentences and what you know about the Greek prefix em- to explain your answer to each question.

Does someone who is emboldened become courageous or fearful?

The electric field of a plane EM wave is given by $E_x=E_0 \cos (k z+\omega t), \quad E_y=E_z=0$. Determine the direction of propagation

A spherically spreading EM wave comes from a $2100~\mathrm{W}$ source. At a distance of $5.0 \mathrm{~m}$, what is the intensity, and what is the rms value of the electric field?

Estimate the radiation pressure due to a bulb emitting $5.0 \mathrm{~W}$ of $\mathrm{EM}$ radiation on a highly absorbing surface at a distance of $8.0 \mathrm{~cm}$ from the center of the bulb. Estimate the force exerted on your fingertip if you place it at this point.

The Great Pyramid of Giza is a square-based pyramid. The base of the pyramid has side length 230.4 m and the vertical height is 146.5 m. The Great Pyramid is represented in the diagram as ABCDE. The vertex E is directly above the centre O of the base. M is the midpoint of BC.

a. Calculate the volume of the pyramid.

b. Find EM.

c. Show that the angle between [EM] and the base of the pyramid is $52^{\circ}$ correct to 2 significant figures.

d. Find the total surface area of the pyramid including the base.

e. Find the angle between an edge and the base.

Consider two possible candidates $E(x, t)$ as solutions of the wave equation for an EM wave's electric field. Let $A$ and $\alpha$ be constants. Show that $E(x, t)=A e^{-\left(\alpha x^2-v t\right)}$ does not satisfy the wave equation.

Suppose a $25~ \mathrm{~kW}$ radio station emits EM waves uniformly in all directions. (a) How much energy per second crosses a $1.0~\mathrm{m}^2$ area $1.0 \mathrm{~km}$ from the transmitting antenna?

(a) What is the binding energy of electrons to a material from which 4.00-eV electrons are ejected by 400-nm EM radiation? (b) What is unreasonable about this result? (c) Which assumptions are unreasonable or inconsistent?

A laser provides pulses of EM-radiation in vacuum lasting $10^{-12} \mathrm{s}$. If the radiant flux density is $10^{20} \mathrm{W} / \mathrm{m}^{2}$, determine the amplitude of the electric field of the beam.