2. An industrial laser is used to burn a hole through a piece of metal. The average intensity of the light is S = 1.50 × 10⁹ W/m2. What is the rms value of the magnetic field in the electromagnetic wave emitted by the laser?

A low-frequency radio wave is oscillating at a rate of 60 MHz with a peak electric field of 120 N/C. Which of the following functions is the correct excpression for the magnetic field? а. 2л B (x,t) =40µTsin -(1.2x)(10'). b. B (x,t) =0.40µTsin 2л Ос. B (x,t) =4.0µTsin 2 1.2)(10), Od. В (х,1) %3D0.40диTsin| (1.0) е. B (x,t) =0.40µTsin (1.2)

3. On a cloudless day, the sunlight that reaches the surface of the earth has an intensity of about 1.50 x 103 W/m². What is the electromagnetic energy contained in 5.10 m3 of space just above the earth's surface?

1. You've recently read about a chemical laser that generates a 20-cm-diameter, 25 MW laser beam. One day, after physics class, you start to wonder if you could use the radiation pressure from this laser beam to launch small payloads into orbit. To see if this might be feasible, you do a quick calculation of the acceleration of a 20-cm-diameter, 100 kg, perfectly absorbing block. What speed would such a block have if pushed horizontally 100 m along a frictionless track by such a laser?

A certain 60.0 Hz AC power line radiates an electromagnetic wave having a maximum electric field strength of 24.0 kV/m. (a) What is the wavelength of this very low frequency electromagnetic wave? m (b) What is its maximum magnetic field strength? Additional Materials

An electromagnetic wave strikes a 1.56-cm² section of wall perpendicularly. The rms value of the wave's magnetic field is determined to be 5.09 x 10-4 T. How long does it take for the wave to deliver 2270 J of energy to the wall? Number i Units Electromagnetic wave

K The maximum magnitude of the electric field in an electromagnetic wave is 20 V/m. What is the maximum magnitude of the magnetic field in this wave? T Submit Answer Tries 0/2

An electromagnetic wave with frequency 65.0 Hz travels in an insulating magnetic material that has dielectric constant 3.64 and relative permeability 5.18 at this frequency. The electric field has amplitude 7.20 × 10-³ V/m. Part A What is the speed of propagation of the wave? 17 ΑΣΦ V= Submit Request Answer Part B What is the wavelength of the wave? ΠΙ ΑΣΦ X = Submit Request Answer ? ? m/s m

4. A spotlight shines onto a square target of area 0.35 m?. If the average rms strength of the magnetic field in the EM waves of the spotlight is 1.2 x 107 T, calculate the energy transferred to the target if it remains in the light for 12 minutes. (Give answer in joules) F3 FB #3 2$ 4 & * 2 3 5 8 9 W E T U K

An electromagnetic wave strikes a 1.22-cm² section of wall perpendicularly. The rms value of the wave's magnetic field is determined to be 4.58 × 10-4 T. How long does it take for the wave to deliver 1140 J of energy to the wall? Number i Units Electromagnetic wave