When E and B Are the Amplitudes of the Electric $\frac { 1 } { 4 } \varepsilon _ { 0 } E ^ { 2 }$

question 27

Multiple Choice

When E and B are the amplitudes of the electric and magnetic fields in an electromagnetic wave in vacuum,the total average energy density in the wave is

• A) \(\frac { 1 } { 4 } \varepsilon _ { 0 } E ^ { 2 }\) .
• B) \(\frac { 1 } { 2 } \varepsilon _ { 0 } E ^ { 2 }\) .
• C)\(\varepsilon\)₀E².
• D) \(\frac { B ^ { 2 } } { \mu _ { 0 } }\) .
• E) \(\frac { E B } { \mu _ { 0 } }\) .

Understand the relationship between price, average cost, and marginal cost in the short run supply decisions.

Recognize the short-run supply curve of a purely competitive producer and its determinants.

Calculate and understand the firm's short-run supply schedule based on price and cost data.

Understand the role and impact of the "yellow press" in late 19th and early 20th century America.

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