Questions from Modern Physics

Q: A small helium–neon laser emits red visible light with a

A small helium–neon laser emits red visible light with a power of 5.80 mW in a beam of diameter 2.50 mm. a. What are the amplitudes of the electric and magnetic fields of this light? b. What are the...

Q: An L-R-C series circuit has C = 4

An L-R-C series circuit has C = 4.80 µF, L = 0.520 H, and source voltage amplitude V = 56.0 V. The source is operated at the resonance frequency of the circuit. If the voltage across the capacitor has...

Q: Five infinite-impedance voltmeters, calibrated to read rms values,

Five infinite-impedance voltmeters, calibrated to read rms values, are connected as shown in Fig. P31.40. Let R = 200 Ω, L = 0.400 H, C = 6.00 µF, and V = 30.0 V. What...

Q: A parallel-plate capacitor having square plates 4.50 cm

A parallel-plate capacitor having square plates 4.50 cm on each side and 8.00 mm apart is placed in series with the following: an ac source of angular frequency 650 rad/s and voltage amplitude 22.5 V;...

Q: A toroidal solenoid has 2900 closely wound turns, cross-sectional

A toroidal solenoid has 2900 closely wound turns, cross-sectional area 0.450 cm2, mean radius 9.00 cm, and resistance R = 2.80 Ω. Ignore the variation of the magnetic field across the cross section of...

Q: A glass plate 2.50 mm thick, with an index

A glass plate 2.50 mm thick, with an index of refraction of 1.40, is placed between a point source of light with wavelength 540 nm (in vacuum) and a screen. The distance from source to screen is 1.80...

Q: A large electromagnetic coil is connected to a 120-Hz ac

A large electromagnetic coil is connected to a 120-Hz ac source. The coil has resistance 400 Ω, and at this source frequency the coil has inductive reactance 250 Ω. a. What is the inductance of the c...

Q: In an L-R-C series circuit, R =

In an L-R-C series circuit, R = 300 Ω, XC = 300 Ω, and XL = 500 Ω. The average electrical power consumed in the resistor is 60.0 W. a. What is the power factor of the circuit? b. What is the rms vol...

Q: At a frequency ω1 the reactance of a certain capacitor equals that

At a frequency ω1 the reactance of a certain capacitor equals that of a certain inductor. a. If the frequency is changed to ω2 = 2 ω1, what is the ratio of the reactance of the inductor to that of th...

Q: One application of L-R-C series circuits is to

One application of L-R-C series circuits is to high-pass or lowpass filters, which filter out either the low- or high-frequency components of a signal. A high-pass filter is shown in Fig. P31.47, wher...