Physics Physics Practice Problems Solutions Library

# Energy Carried by Electromagnetic Waves Solutions Library

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50 solutions

Energy Carried by Electromagnetic Waves

#### Q. LASIK eye surgery uses pulses of laser light to shave off tissue from the cornea, reshaping it. A typical LASIK laser emits a 1.0-mm-diameter laser...

Solved • Feb 8, 2021

Energy Carried by Electromagnetic Waves

#### Q. The energy per unit volume in an electromagnetic wave isA) all in the magnetic field.B) mostly in the electric field.C) equally divided between the...

Solved • Dec 16, 2020

Energy Carried by Electromagnetic Waves

#### Q. When waves travel then some of the wave's energy dissipates as heat. In time, this will reduce the wave'sA) FrequencyB) AmplitudeC) vibrationD) wav...

Solved • Nov 2, 2020

Energy Carried by Electromagnetic Waves

#### Q. A college radio station has low power and it broadcasts 10 w of electromagnetic waves.Calculate the distance from the antenna for the electric fiel...

Solved • Oct 14, 2020

Energy Carried by Electromagnetic Waves

#### Q. An electron beam is shot into a region where there is both an electric field pointing upward of magnitude E = 1.6 N/C, and a magnetic field, B, as ...

Solved • Sep 28, 2020

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. Which photon has more energy?A. a photon of red lightB. a photon of yellow lightC. a photon of green lightD. a photon of ultraviolet radiationE. a ...

Solved • Jul 14, 2020

Energy Carried by Electromagnetic Waves

#### Q. In the video, we see that sunscreen protects the skin byA) Reflecting ultraviolet light.B) Shifting the photon energy of ultraviolet light to a saf...

Solved • Jul 14, 2020

Energy Carried by Electromagnetic Waves

#### Q. When an ultraviolet photon is absorbed by a molecule of DNA, the photon's energy can be converted into vibrational energy of the molecular bonds. E...

Solved • Jul 14, 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. &lt;P&gt; = 330 MW b. &lt;P&gt; = 485 MW c. &lt;P&gt; = 667 MW d. &lt;...

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