Exam 21: Alternating Current Circuits and Electromagnetic Waves

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What is the impedance of an AC series circuit that is constructed of a 10.0-W resistor along with 12.0 W inductive reactance and 7.0 W capacitive reactance?

(Multiple Choice)

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Question 21

A radar pulse sent out to an airplane at a distance of 20.0 km will return as an echo to the source in what time interval? (c = 3.00 x 10⁸ m/s)

(Multiple Choice)

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Question 22

In order to keep its food hot,a restaurant will place it under which type of lamp?

(Multiple Choice)

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Question 23

In the Doppler effect for electromagnetic waves,which of the following gives the greatest shift in frequency?

(Multiple Choice)

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Question 24

Find the frequency of x-rays of wavelength 10^-10m.(c = 3 x 10⁸ m/s)

(Multiple Choice)

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Question 25

An electromagnetic wave with a peak magnetic field component of 1.5 x 10^-7 T has an associated peak electric field component of what value? (m₀ = 4p x 10^-7 Tm/A,e₀ = 8.85 x 10^-12 C²/Nm² and c = 3.00 x 10⁸ m/s)

(Multiple Choice)

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Question 26

The human eye is sensitive to light with wavelength down to 390 nm.What is the frequency of radiation at this wavelength? (1 nm = 10^-9 m and c = 3.00 x 10⁸ m/s)

(Multiple Choice)

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Question 27

In a 60-Hz RLC circuit,the phase angle is positive.The values of the resistance,inductance,and the capacitance are now doubled.Which of the following is now true about the phase angle?

(Multiple Choice)

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Question 28

The electric field, ,in an electromagnetic wave is oriented in what direction with respect to its associated magnetic field, ?

(Multiple Choice)

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Question 29

Which of the following combinations of circuit components can be used to make a tuner for a radio,to select the desired frequency?

(Multiple Choice)

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Question 30

Of the various types of electromagnetic radiation,which is the most penetrating through all forms of matter?

(Multiple Choice)

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Question 31

In an AC circuit,the ratio of average current to maximum current is:

(Multiple Choice)

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Question 32

Maxwell guessed that visible light was an electromagnetic wave because of its:

(Multiple Choice)

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Question 33

Determine the amount of energy carried in l.0 m of a 3.5-mW He-Ne laser beam if the cross-sectional area of the beam is 5.0 x 10^-6 m².

(Multiple Choice)

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Question 34

When a 50-mF capacitor is attached to an AC source,its capacitive reactance is 40 W.If instead a 100-mF capacitor is attached to the same source,what will be its capacitive reactance?

(Multiple Choice)

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Question 35

The electromagnetic radiation that causes tanning:

(Multiple Choice)

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Question 36

In an RC circuit,which of the following is a possible phase angle?

(Multiple Choice)

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Question 37

In an AC series circuit the inductive reactance is 50 W and the frequency is 100 Hz.What is the inductance in the circuit?

(Multiple Choice)

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Question 38

The current in an inductor connected to an AC voltage source lags the voltage.This lag is caused by the:

(Multiple Choice)

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Question 39

An AC voltage source,with a peak output of 200 V,is connected to a 50-W resistor.What is the effective (or rms)current in the circuit?

(Multiple Choice)

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Question 40

Showing 21 - 40 of 102

Exam 21: Alternating Current Circuits and Electromagnetic Waves

What is the impedance of an AC series circuit that is constructed of a 10.0-W resistor along with 12.0 W inductive reactance and 7.0 W capacitive reactance?

A radar pulse sent out to an airplane at a distance of 20.0 km will return as an echo to the source in what time interval? (c = 3.00 x 108 m/s)

In order to keep its food hot,a restaurant will place it under which type of lamp?

In the Doppler effect for electromagnetic waves,which of the following gives the greatest shift in frequency?

Find the frequency of x-rays of wavelength 10-10 m.(c = 3 x 108 m/s)

An electromagnetic wave with a peak magnetic field component of 1.5 x 10-7 T has an associated peak electric field component of what value? (m0 = 4p x 10-7 T*m/A,e0 = 8.85 x 10-12 C2/N*m2 and c = 3.00 x 108 m/s)

The human eye is sensitive to light with wavelength down to 390 nm.What is the frequency of radiation at this wavelength? (1 nm = 10-9 m and c = 3.00 x 108 m/s)

In a 60-Hz RLC circuit,the phase angle is positive.The values of the resistance,inductance,and the capacitance are now doubled.Which of the following is now true about the phase angle?

The electric field, ,in an electromagnetic wave is oriented in what direction with respect to its associated magnetic field, ?

Which of the following combinations of circuit components can be used to make a tuner for a radio,to select the desired frequency?

Of the various types of electromagnetic radiation,which is the most penetrating through all forms of matter?

In an AC circuit,the ratio of average current to maximum current is:

Maxwell guessed that visible light was an electromagnetic wave because of its:

Determine the amount of energy carried in l.0 m of a 3.5-mW He-Ne laser beam if the cross-sectional area of the beam is 5.0 x 10-6 m2.

When a 50-mF capacitor is attached to an AC source,its capacitive reactance is 40 W.If instead a 100-mF capacitor is attached to the same source,what will be its capacitive reactance?

The electromagnetic radiation that causes tanning:

In an RC circuit,which of the following is a possible phase angle?

In an AC series circuit the inductive reactance is 50 W and the frequency is 100 Hz.What is the inductance in the circuit?

The current in an inductor connected to an AC voltage source lags the voltage.This lag is caused by the:

An AC voltage source,with a peak output of 200 V,is connected to a 50-W resistor.What is the effective (or rms)current in the circuit?

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Filters

A radar pulse sent out to an airplane at a distance of 20.0 km will return as an echo to the source in what time interval? (c = 3.00 x 10⁸ m/s)

Find the frequency of x-rays of wavelength 10^-10m.(c = 3 x 10⁸ m/s)

An electromagnetic wave with a peak magnetic field component of 1.5 x 10^-7 T has an associated peak electric field component of what value? (m₀ = 4p x 10^-7 Tm/A,e₀ = 8.85 x 10^-12 C²/Nm² and c = 3.00 x 10⁸ m/s)

The human eye is sensitive to light with wavelength down to 390 nm.What is the frequency of radiation at this wavelength? (1 nm = 10^-9 m and c = 3.00 x 10⁸ m/s)

Determine the amount of energy carried in l.0 m of a 3.5-mW He-Ne laser beam if the cross-sectional area of the beam is 5.0 x 10^-6 m².