Questions from Modern Physics

Q: There are two categories of ultraviolet light. Ultraviolet A (UVA

There are two categories of ultraviolet light. Ultraviolet A (UVA) has a wavelength ranging from 320 nm to 400 nm. It is necessary for the production of vitamin D. UVB, with a wavelength in vacuum bet...

Q: A sinusoidal electromagnetic wave having a magnetic field of amplitude 1.

A sinusoidal electromagnetic wave having a magnetic field of amplitude 1.25 µT and a wavelength of 432 nm is traveling in the +x-direction through empty space. a. What is the frequency o...

Q: Consider electromagnetic waves propagating in air. a. Determine the

Consider electromagnetic waves propagating in air. a. Determine the frequency of a wave with a wavelength of i. 5.0 km, ii. 5.0 µm, iii. 5.0 nm. b. What is the wavelength (in meters and nanometer...

Q: In the United States, household electrical power is provided at a

In the United States, household electrical power is provided at a frequency of 60 Hz, so electromagnetic radiation at that frequency is of particular interest. On the basis of the ICNIRP guidelines, w...

Q: Doubling the frequency of a wave in the range of 25 Hz

Doubling the frequency of a wave in the range of 25 Hz to 3 kHz represents what change in the maximum allowed electromagnetic-wave intensity? a. A factor of 2; b. a factor of 1/ 2 ; c. a factor of...

Q: A resistance R, capacitance C, and inductance L are connected

A resistance R, capacitance C, and inductance L are connected in series to a voltage source with amplitude V and variable angular frequency ω. If ω = ω0, the resonance angular frequency, find a. the...

Q: Consider an L-R-C series circuit with a 1

Consider an L-R-C series circuit with a 1.80-H inductor, a 0.900-µF capacitor, and a 300-Ω resistor. The source has terminal rms voltage Vrms = 60.0 V and variable angular frequency ω. a. What is the...

Q: A ray of light is traveling in a glass cube that is

A ray of light is traveling in a glass cube that is totally immersed in water. You find that if the ray is incident on the glass– water interface at an angle to the normal larger than 48.7°, no light...

Q: An L-R-C series circuit draws 220 W from

An L-R-C series circuit draws 220 W from a 120-V (rms), 50.0-Hz ac line. The power factor is 0.560, and the source voltage leads the current. a. What is the net resistance R of the circuit? b. Find...

Q: Consider a sinusoidal electromagnetic wave with fields E = Emax

Consider a sinusoidal electromagnetic wave with fields E = Emax