Questions from Modern Physics

Q: Can a transformer be used with dc? Explain. What happens

Can a transformer be used with dc? Explain. What happens if a transformer designed for 120-V ac is connected to a 120-V dc line?

Q: An ideal transformer has N1 windings in the primary and N2 windings

An ideal transformer has N1 windings in the primary and N2 windings in its secondary. If you double only the number of secondary windings, by what factor does a. the voltage amplitude in the secondar...

Q: An L-R-C series circuit with L = 0

An L-R-C series circuit with L = 0.120 H, R = 240 Ω, and C = 7.30 µF carries an rms current of 0.450 A with a frequency of 400 Hz. a. What are the phase angle and power factor for this circuit? b. W...

Q: When light is incident on an interface between two materials, the

When light is incident on an interface between two materials, the angle of the refracted ray depends on the wavelength, but the angle of the reflected ray does not. Why should this be?

Q: You want to double the resonance angular frequency of an L-

You want to double the resonance angular frequency of an L-R-C series circuit by changing only the pertinent circuit elements all by the same factor. a. Which ones should you change? b. By what fact...

Q: When driving on the upper level of the Bay Bridge, westbound

When driving on the upper level of the Bay Bridge, westbound from Oakland to San Francisco, you can easily pick up a number of radio stations on your car radio. But when driving eastbound on the lower...

Q: A salesperson at a bargain counter claims that a certain pair of

A salesperson at a bargain counter claims that a certain pair of sunglasses has Polaroid filters; you suspect that the glasses are just tinted plastic. How could you find out for sure?

Q: Light scattered from blue sky is strongly polarized because of the nature

Light scattered from blue sky is strongly polarized because of the nature of the scattering process described in Section 33.6. But light scattered from white clouds is usually not polarized. Why not?...

Q: Atmospheric haze is due to water droplets or smoke particles (“smog

Atmospheric haze is due to water droplets or smoke particles (“smog”). Such haze reduces visibility by scattering light, so that the light from distant objects becomes randomized and images become ind...

Q: The explanation given in Section 33.6 for the color of

The explanation given in Section 33.6 for the color of the setting sun should apply equally well to the rising sun, since sunlight travels the same distance through the atmosphere to reach your eyes a...