Exam 21: Alternating Current Circuits and Electromagnetic Waves

A radar pulse returns 3.0 x 10^-4 seconds after it is sent out,having been reflected by an object.What is the distance between the radar antenna and the object? (c = 3.00 x 10⁸ m/s)

Consider an AC series circuit containing a coil,capacitor and resistance.Tripling the frequency will change the capacitive reactance by what factor?

Which condition of motion must be met with regard to a charged particle if it is in the process of emitting electromagnetic radiation?

What value of inductance should be used in a series circuit with a capacitor of 1.8 x 10^-3 mF when designed to radiate a wavelength of 35 m? (c = 3.00 x 10⁸ m/s)

An AM radio tuning circuit has a coil with an inductance of 6.00 mH and a capacitor set at 7.50 x 10^-6 mF.What frequency will it detect?

Temperature variation of different parts of a person's body can be detected by analyzing the emission pattern of which type of electromagnetic radiation?

Consider an AC series circuit containing a coil,capacitor and resistance.Tripling the frequency will change the inductive reactance by what factor?

A 200-W resistor is connected in series with a 10-µF capacitor and a 60-Hz,120-V (rms)line voltage.If electrical energy costs 5.0¢ per kWh,how much does it cost to leave this circuit connected for 24 hours?

What is the wavelength of 100-MHz television EM waves? (c = 3 x 10⁸ m/s)

A series RLC circuit has a inductive reactance of 4 W and a capacitive reactance of 1/4 W.By what factor should the AC frequency be changed to put this circuit into resonance?

An AC power generator produces 50 A (rms)at 3 600 V.The voltage is stepped up to 100 000 V by an ideal transformer,and the energy transmitted through a long-distance power line with a total resistance of 100 W.What is the rms current in the long-distance line?

The frequency in an AC series circuit is doubled.By what factor does this change the capacitive reactance?

Which one of the following scientists first built and operated devices that could emit and detect man-made electromagnetic radiation?

In a northern latitude an experiment is performed on 3.50- sheet of roofing material which is placed in sunlight of intensity making normal incidence on its top surface.The ambient temperature surrounding the material on both top and bottom is 275 K.If the material acts as a perfect blackbody and sheds half of the incident radiation by thermal radiation,what equilibrium temperature does is reach?

The Doppler shift for electromagnetic radiation from distant galaxies moving away from the observer is called a:

An RLC circuit has resistance R₀,inductance L₀,and capacitance C₀.If the resistance value is now doubled,which values of inductance and capacitance will result in the same resonant frequency as before.

The Earth is 1.49 x 10¹¹ m from the Sun.If the solar radiation at the top of the Earth's atmosphere is 1 340 W/m²,what is the total power output of the Sun?

What is the average power dissipation in an RLC series circuit in which R = 100 W,L = 0.1 H,and C = 10 µF driven at resonance by a 100-V (rms)source?

A resistor,inductor,and capacitor are connected in series,each with an effective (rms)voltage of 65 V,140 V,and 80 V,respectively.What is the magnitude of the phase angle in this circuit?

Consider an AC series circuit containing a coil,capacitor and resistance.Tripling the frequency will change the circuit's impedance by what factor?