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Practice Questions



This activity contains 21 questions.

Question 1.

The above figure represents an electromagnetic wave frozen in time. The blue line is the


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Question 2.
If the wavelength of the wave in the above question is 3 x 10-5m the wave is


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Question 3.
If the wavelength of the wave in Question 1 is 3 nm the wave is


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Question 4.
If the wavelength of the wave in Question 1 is 0.6 microns the wave is


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Question 5.
If the wavelength of the wave in Question 1 is 10 km the wave is


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Question 6.

In the figure an electromagnetic wave is shown moving left to right. If the number in the upper right is the time measured in units of 100ps the wave is a

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Question 7.
What is the wavelength of the wave in Question 6?


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Question 8.
If the time counter in Question 6 is clicking time in units of 0.2fs the wave is


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Question 9.
The wavelength of the wave in Question 8 is


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Question 10.
If the counter in Question 6 is counting in seconds the wave is


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Question 11.
What would be the wavelength of the wave in Question 10?


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Question 12.

If the electric vector in the E & M wave has a maximum value of 1000 V/m what is the value for the maximum of the magnetic vector?

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Question 13.
What is the energy density (energy per cubic meter) in a small region of space in the above wave at an instant of time when the electric vector is a maximum?


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Question 14.
What is the energy density (energy per cubic meter) carried by the magnetic field vector in a small region of space in the above wave at an instant of time when the electric vector is a maximum?


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Question 15.
What is the average intensity of the E & M wave in Question 12 ?


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Question 16.
On a very clear day in summer the solar intensity in the 'little lattitudes' might reach 1000 W/m2 (averaged over time). What would be the maximum value for the electric vector?


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Question 17.
What is the (maximum) magnetic field vector in the above question?


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Question 18.
As a capacitor charges


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Question 19.
A 10 volt battery is connected to a switch, a 35 microF capacitor, and a 120 ohm resistor. Two milliseconds after the switch is closed, what is the voltage on the capacitor?


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Question 20.
What is Maxwell's displacement current inside the capacitor in the previous question at 2 ms?


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Question 21.
What is the rate of change of the electric flux in the capacitor in Question 19?


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