Physics Physics Practice Problems Solutions Library

Energy Carried by Electromagnetic Waves Solutions Library

Access 42 Energy Carried by Electromagnetic Waves video and text solutions to help you complete your homework. Need to revisit the concept? Watch our Energy Carried by Electromagnetic Waves learn videos.

Browse Solutions

42 solutions

Energy Carried by Electromagnetic Waves

Q. At one instant the electric and magnetic fields at one point of an electromagnetic wave are E=(25i + 350j-50k) V/m and B = 0.0254(7.2i-7.0j - 45.4k...

Solved • Aug 7, 2020

Energy Carried by Electromagnetic Waves

Q. What is the instantaneous energy density UE (t) in the electric field of the wave?Give your answer in terms of some or all of the variables in E = ...

Solved • Jul 24, 2020

Energy Carried by Electromagnetic Waves

Q. Lasers can be constructed that produce an extremely high-intensity electromagnetic wave for a brief time - called pulsed lasers. They are used to i...

Solved • Jul 15, 2020

Energy Carried by Electromagnetic Waves

Q. A light-emitting diode (LED) connected to a 3.0 V power supply emits 440 nm blue light. The current in the LED is 16mA, and the LED is 71% efficien...

Solved • Jun 2, 2020

Energy Carried by Electromagnetic Waves

Q. Which of the following statements about radiation is true?A) Your body contains a number of radioactive isotopes. B) One rem is enough to kill appr...

Solved • May 21, 2020

Energy Carried by Electromagnetic Waves

Q. On its highest power setting, a microwave oven can increase the temperature of 0.425 kg of spaghetti by 45°C in 120 seconds. If the average intensi...

Solved • May 15, 2020

Energy Carried by Electromagnetic Waves

Q. On its highest power setting, a microwave oven can increase the temperature of 0.425 kg of spaghetti by 45°C in 120 seconds.A) What was the rate of...

Solved • May 11, 2020

Energy Carried by Electromagnetic Waves

Q. An AM radio transmitter broadcasts 25 kW of power uniformly in all directions.a) Assuming all of the radio waves that strike the ground are complet...

Solved • May 7, 2020

Energy Carried by Electromagnetic Waves

Q. Suppose the maximum safe average intensity of microwaves for human exposure is 1.00 W/m2. Early radar units leaked radiation more than modern ones ...

Solved • May 7, 2020

Energy Carried by Electromagnetic Waves

Q. a) What is the intensity in W/m² of a laser beam used to burn away cancerous tissue that, when 89.5% absorbed, puts 497 J of energy into a circular...

Solved • May 5, 2020

Energy Carried by Electromagnetic Waves

Q. Of these electromagnetic waves, which has the longest wavelength?greatest energy?greatest frequency? lowest amplitude?

Solved • Apr 20, 2020

Energy Carried by Electromagnetic Waves

Q. The maximum allowed leakage of microwave radiation from a microwave oven is 5.0 mW/cm2.If microwave radiation outside an oven has the maximum value...

Solved • Apr 10, 2020

Energy Carried by Electromagnetic Waves

Q. A 60-W light bulb radiates electromagnetic waves uniformly in all directions. At a distance of 1.0 m from the bulb, the light intensity is I0, the ...

Solved • Apr 8, 2020

Energy Carried by Electromagnetic Waves

Q. Rank the light intensity, from largest to smallest, at the point P in the figures.

Solved • Apr 7, 2020

Energy Carried by Electromagnetic Waves

Q. Laser beams are sometimes used to burn away cancerous tissue.  What is the intensity, in watts per square meter, of a laser beam that is 90.0% abso...

Solved • Mar 18, 2020

Energy Carried by Electromagnetic Waves

Q. A 193nm-wavelength UV laser for eye surgery emits a 0.500mJ pulse. (a) How many photons does the light pulse contain?

Solved • Mar 10, 2020

Energy Carried by Electromagnetic Waves

Q. The energy density of an electromagnetic wave isA) equally divided between the magnetic and the electric fields.B) entirely in the magnetic field.C...

Solved • Jun 20, 2017

Energy Carried by Electromagnetic Waves

Q. The graph shows the intensity of transmitted light of different colors (wavelengths) as a function of depth x in meters for absorption in water. Ap...

Solved • May 22, 2017

Energy Carried by Electromagnetic Waves

Q. The energy flow per unit time per unit area (S) of an electromagnetic wave has an average value of 695 mW/m2. The wave is incident upon a rectangul...

Solved • Apr 18, 2017

Energy Carried by Electromagnetic Waves

Q. Calculate the total average power of the station's radio transmitter. a. <P> = 330 MW b. <P> = 485 MW c. <P> = 667 MW d. <...

Solved • Apr 10, 2017

Energy Carried by Electromagnetic Waves

Q. If the magnetic field in a traveling electromagnetic wave has a maximum value of 16.5 nT. What is the maximum value of the electric field associate...

Solved • Apr 5, 2017

Energy Carried by Electromagnetic Waves

Q. An isotropic source of electromagnetic radiation emits light that, when measured at 10 cm from the source, carries an electric field amplitude of 1...

Solved • Mar 24, 2017

Energy Carried by Electromagnetic Waves

Q. You are trying to estimate the efficiency of a lightbulb by measuring the power of the light emitted vs the power consumed by the bulb. You have a ...

Solved • Mar 10, 2017

Energy Carried by Electromagnetic Waves

Q. An open MRI scanner can produce a magnetic field strength of up to 3 T. If the space between the poles of the magnet (where the patient lies) is cy...

Solved • Mar 2, 2017

Energy Carried by Electromagnetic Waves

Q. A point source emits electromagnetic radiation uniformly in all directions. If the power output of the source is 960 W, what are the amplitudes of ...

Solved • Feb 3, 2017

Energy Carried by Electromagnetic Waves

Q. A cylindrical laser beam has diameter 8.00 mm. The average energy density in the beam is 8.00 x 10-3 J/m3. What is the power output of the laser?

Solved • Feb 3, 2017

Energy Carried by Electromagnetic Waves

Q. A cylindrical laser beam has diameter 8.00 mm. The average energy density in the beam is 8.00 x 10-3 J/m3. What is the amplitude of the magnetic fi...

Solved • Feb 3, 2017

Energy Carried by Electromagnetic Waves

Q. Sinusoidal electromagnetic waves from a radio station process pass perpendicularly through an open window that has area 0.400 m2. The intensity of ...

Solved • Feb 2, 2017

Energy Carried by Electromagnetic Waves

Q. Sinusoidal electromagnetic waves from a radio station process pass perpendicularly through an open window that has area 0.400 m2. The intensity of ...

Solved • Feb 2, 2017

Energy Carried by Electromagnetic Waves

Q. Sinusoidal electromagnetic waves from a radio station process pass perpendicularly through an open window that has area 0.400 m2. The intensity of ...

Solved • Feb 2, 2017

Energy Carried by Electromagnetic Waves

Q. Sinusoidal electromagnetic waves from a radio station pass perpendicularly through an open window that has area 0.200 m2. At the window, the magnet...

Solved • Feb 2, 2017

Energy Carried by Electromagnetic Waves

Q. A point source of electromagnetic waves emits waves uniformly in all directions. At a distance of 10.0 m from the source the magnetic field amplitu...

Solved • Feb 2, 2017

Energy Carried by Electromagnetic Waves

Q. The power radiated by a star is 8.0 x 1030 W. What is the intensity of the radiation from this star at a distance of 1.0 x 1012 m from the star?(a)...

Solved • Feb 1, 2017

Energy Carried by Electromagnetic Waves

Q. A sinusoidal electromagnetic wave has intensity I = 100 W/m 2 and an electric field amplitude E. What is the electric field amplitude of a 50 W/m 2...

Solved • Jan 24, 2017

Energy Carried by Electromagnetic Waves

Q. An 800-kHz signal is detected at a point 7.7 km distant from a transmitter tower. The electric field amplitude of the signal at that point is 550 m...

Solved • Jan 11, 2017

Energy Carried by Electromagnetic Waves

Q. An 800-kHz radio signal is detected at a point 4.5 km distant from a transmitter tower. The electric field amplitude of the signal at that point is...

Solved • Jan 11, 2017

Energy Carried by Electromagnetic Waves

Q. Two sources of sinusoidal electromagnetic waves have average powers of P1 = 100.0 W and P2 = 320 W and emit uniformly in all directions. For the el...

Solved • Jan 11, 2017

Energy Carried by Electromagnetic Waves

Q. Two sources of sinusoidal electromagnetic waves have average powers of P1 = 100.0 W and P2 = 320 W and emit uniformly in all directions. At the sam...

Solved • Jan 11, 2017

Energy Carried by Electromagnetic Waves

Q. A laser beam has a wavelength of 633 nm and a power of 0.500 mW spread uniformly over a circle 1.20 mm in diameter. This beam falls perpendicularly...

Solved • Jan 10, 2017

Energy Carried by Electromagnetic Waves

Q. A laser beam has a wavelength of 633 nm and a power of 0.500 mW spread uniformly over a circle 1.20 mm in diameter. This beam falls perpendicularly...

Solved • Jan 10, 2017

Energy Carried by Electromagnetic Waves

Q. A large electromagnet has a 22 T magnetic field between its poles. What is the magnetic energy density between the poles? A) 240 J/cm3 B) 30,000 ...

Solved • Jan 10, 2017

Energy Carried by Electromagnetic Waves

Q. A large electromagnet has a 22T magnetic field between its poles. What is the magnetic energy density between the poles?A) 88 J/cm3B) 190 J/cm3C) 3...

Solved • Jan 6, 2017