Questions from Modern Physics

Q: The energy flow to the earth from sunlight is about 1.

The energy flow to the earth from sunlight is about 1.4 kW/m2. a. Find the maximum values of the electric and magnetic fields for a sinusoidal wave of this intensity. b. The distance from the earth...

Q: a. Show that for an L-R-C series

a. Show that for an L-R-C series circuit the power factor is equal to R/Z. b. An L-R-C series circuit has phase angle -31.5o. The voltage amplitude of the source is 90.0 V. What is the voltage amplit...

Q: A sinusoidal electromagnetic wave emitted by a cellular phone has a wavelength

A sinusoidal electromagnetic wave emitted by a cellular phone has a wavelength of 35.4 cm and an electric-field amplitude of 5.40 * 10-2 V/m at a distance of 250 m from the phone. Calculate a. the fr...

Q: The resistor, inductor, capacitor, and voltage source described in

The resistor, inductor, capacitor, and voltage source described in Exercise 31.14 are connected to form an L-R-C series circuit. a. What is the impedance of the circuit? b. What is the current ampli...

Q: A monochromatic light source with power output 60.0 W radiates

A monochromatic light source with power output 60.0 W radiates light of wavelength 700 nm uniformly in all directions. Calculate Emax and Bmax for the 700-nm light at a distance of 5.00 m from the sou...

Q: An L-R-C series circuit is connected to a

An L-R-C series circuit is connected to a 120-Hz ac source that has Vrms = 80.0 V. The circuit has a resistance of 75.0 Ω and an impedance at this frequency of 105 Ω. What average power is delivered t...

Q: An intense light source radiates uniformly in all directions. At a

An intense light source radiates uniformly in all directions. At a distance of 5.0 m from the source, the radiation pressure on a perfectly absorbing surface is 9.0 * 10-6 Pa. What is the total averag...

Q: In the 25-ft Space Simulator facility at NASA’s Jet Propulsion

In the 25-ft Space Simulator facility at NASA’s Jet Propulsion Laboratory, a bank of overhead arc lamps can produce light of intensity 2500 W/m2 at the floor of the facility. (This simulates the inten...

Q: If the eye receives an average intensity greater than 1.0

If the eye receives an average intensity greater than 1.0 * 102 W/m2, damage to the retina can occur. This quantity is called the damage threshold of the retina. a. What is the largest average power...

Q: An L-R-C series circuit is constructed using a

An L-R-C series circuit is constructed using a 175-Ω resistor, a 12.5-µF capacitor, and an 8.00-mH inductor, all connected across an ac source having a variable frequency and a voltage amplitude of 25...