College Physics
OER 2016 Edition
ISBN: 9781947172173
Author: OpenStax
Publisher: OpenStax College
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Textbook Question
Chapter 24, Problem 6PE
(a) Two microwave frequencies are authorized for use in microwave ovens: 900 and 2560 MHZ. Calculate the wavelength at each. (b) Which frequency would produce smaller hot spots in foods due to interference effects?
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Chapter 24 Solutions
College Physics
Ch. 24 - The direction of the electric field shown in each...Ch. 24 - Is the direction of the magnetic field shown in...Ch. 24 - Why is the direction of the current shown in each...Ch. 24 - Prob. 4CQCh. 24 - Prob. 5CQCh. 24 - Should the straight wire antenna of a radio he...Ch. 24 - Under what conditions might wires in a DC circuit...Ch. 24 - Give an example of interference of electromagnetic...Ch. 24 - Prob. 9CQCh. 24 - Can an antenna be any length? Explain your answer.
Ch. 24 - If you live in a region that has a particular TV...Ch. 24 - Explain why people who have the lens of their eye...Ch. 24 - How do ?uorescent soap residues make clothing look...Ch. 24 - Give an example of resonance in the reception of...Ch. 24 - Illustrate that the size of details of an object...Ch. 24 - Why don't buildings block radio waves as...Ch. 24 - Make a list of some everyday objects and decide...Ch. 24 - Your friend says mat more patterns and colors can...Ch. 24 - The rate at which information can be transmitted...Ch. 24 - Give an example of energy carried by an...Ch. 24 - In an MRI scan, a higher magnetic field requires...Ch. 24 - Laser vision correction often uses an excimer...Ch. 24 - Verify that the correct value for the speed of...Ch. 24 - Show that, when SI units for 0 and 0 are entered,...Ch. 24 - What is the maximum electric field strength in an...Ch. 24 - The maximum magnetic field strength of an...Ch. 24 - Verify the units obtained for magnetic field...Ch. 24 - (a) Two microwave frequencies are authorized for...Ch. 24 - (a) Calculate the range of wavelength for AM radio...Ch. 24 - A radio station utilizes frequencies between...Ch. 24 - Find the frequency range of visible light, given...Ch. 24 - Combing your hair leads to excess electrons on the...Ch. 24 - Electromagnetic radiation having a 15.0m...Ch. 24 - Approximately what is the smallest detail...Ch. 24 - A radar used to detect the presence of aircraft...Ch. 24 - Some radar systems detect the size and shape of...Ch. 24 - Determine the amount of time it takes for X-rays...Ch. 24 - If you wish to detect details of the size of atoms...Ch. 24 - If the Sun suddenly turned off, we would not know...Ch. 24 - Distances in space are often quoted in units of...Ch. 24 - A certain 50.0-Hz AC power line radiates an...Ch. 24 - During normal bee?ng, the heat creates a maximum...Ch. 24 - (a) The ideal size (most efficient) for a...Ch. 24 - (a) What is the wavelength of 100MHz radio waves...Ch. 24 - (a) What is the frequency at the 193-nm...Ch. 24 - Prob. 24PECh. 24 - Conversations with astronauts on lunar walks had...Ch. 24 - Lunar astronauts placed a reflector on the Moon's...Ch. 24 - Radar is used to determine distances to various...Ch. 24 - Integrated Concepts (a) Calculate the ratio of the...Ch. 24 - Integrated Concepts (a) Calculate the rate in...Ch. 24 - What is the intensity of an electromagnetic wave...Ch. 24 - Find the intensity of an electromagnetic wave...Ch. 24 - Assume the helium-neon lasers commonly used in...Ch. 24 - An AM radio transmitter broadcasts 50.0 kW of...Ch. 24 - Suppose the maximum safe intensity of microwaves...Ch. 24 - Prob. 35PECh. 24 - Lasers can be constructed that produce an...Ch. 24 - Show that for a continuous sinusoidal...Ch. 24 - Suppose a source of electromagnetic waves radiates...Ch. 24 - Integrated Concepts An LC circuit with a 5.00pF...Ch. 24 - Integrated Concepts What capacitance is needed in...Ch. 24 - Integrated Concepts Police radar determines the...Ch. 24 - Integrated Concepts Assume the mostly infrared...Ch. 24 - Integrated Concepts On its highest power se1ting,...Ch. 24 - Integrated Concepts Electromagnetic radiation from...Ch. 24 - Integrated Concepts A 200-turn flat coil of wire...Ch. 24 - Integrated Concepts If electric and magnetic field...Ch. 24 - Unreasonable Results A researcher measures the...Ch. 24 - Unreasonable Results The peak magnetic field...Ch. 24 - Unreasonable Results An LC circuit containing a...Ch. 24 - Unreasonable Results An LC circuit containing a...Ch. 24 - Create Your Own Problem Consider electromagnetic...Ch. 24 - Create Your Own Problem Consider the most recent...Ch. 24 - Prob. 1TPCh. 24 - Prob. 2TPCh. 24 - Prob. 3TPCh. 24 - Prob. 4TPCh. 24 - Prob. 5TPCh. 24 - Prob. 6TPCh. 24 - Prob. 7TPCh. 24 - Prob. 8TPCh. 24 - Prob. 9TPCh. 24 - Prob. 10TPCh. 24 - Prob. 11TPCh. 24 - Prob. 12TP
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- A radio station broadcasts its radio waves with a power of 50,000 W. What would be the intensity of this signal if it is received on a planet orbiting Proxima Centuri, the closest star to our Sun, at 4.243 ly away?arrow_forwardSuppose the maximum safe intensity of microwaves for human exposure is taken to be 1,00 W/m2. (a) If a radar unit leaks 10.0 W of microwaves (other than those sent by its antenna) uniformly in all directions, how far away must you be to be exposed to an intensity considered to be safe? Assume that the power spreads uniformly over the area of a sphere with no complications from absorption or reflection, (b) What is the maximum electric field strength at the safe intensity? (Note that early radar units leaked more than modem ones do. This caused identifiable health problems, such as cataracts, for people who worked near them.)arrow_forwardWhat are the wavelengths of (a) X-rays of frequency 2.01017 Hz? (b) Yellow light of frequency 5.11014Hz ? (C) Gamma rays of frequency 1.01023Hz ?arrow_forward
- If electric and magnetic field strengths vary sinusoidally in time, being zero at t=0, then E=E0 sin 2πft and B=B0 Sin 2πft . Let f = 1.00 GHz here When do they reach their most negative value?arrow_forward(a) Calculate the wavelength of the radio waves from WWVB. (b) Estimate the error that the travel time of the signal causes in synchronizing a radio controlled watch in Norfolk, Virginia, which is 1570 mi (2527 km) from FortCollins, Colorado.arrow_forwardThisarrow_forward
- Extremely low-frequency (ELF) waves that can penetrate the oceans are the only practical means of communicating with distant submarines. (a) Calculate the length of a quarter- wavelength antenna for a transmitter generating ELFwaves of frequency 75.0 Hz into air. (b) How practical is this means of communication?arrow_forwardIf electric and magnetic field strengths vary sinusoidally in time, being zero at t =0, then E =E0 sin 2πft and B= B0 sin 2πft. Let f =1.00 GHz here. (a) When are the field strengths first zero? (b) When do they reach their most negative value? (c) How much time is needed for them to complete one cycle?arrow_forward6) THE POWER OF THE SUN AN TOTAL AT ALL em WAVELENGTHS THE DISTANCE BETWEEN SUN & EARTH IS r = 150,000,000 KM. IS 3.9 x 1026 W. (A) IF THE SUN IS DIRECTLY OVERHEAD, HOW MUCH POWER STRIKES A ROOF-TOP SOLAR CELL ARRAY CONSISTING OF 24 SOLAR PANELS, EACH MEASURING 1.5m x 2.5m? (8) IF EACH CELL IS 75% EFFICIENT AT CONVERTING THE SUN'S ENERGY TO ELECTRICITY, How MUCH POWER IS AVAILABLE ? (C) HOW DO THESE TWO ANSWERS CHANCE AT DEARBORN'S LATITUDE OF 42°arrow_forward
- A microwave source produces pulses of 16.0-GHz radiation, with each pulse lasting 1.00 ns. A parabolic reflector with a face area of radius 4.50 cm is used to focus the microwaves into a parallel beam of radiation, as shown in figure below. The average power during each pulse is 30.0 KW. (a) What is the wavelength of these microwaves? (b) What is the total energy contained in each pulse? (c) Compute the average energy density inside each pulse. IL (a) Determine the amplitude of the electric field and magnetic field in these microwaves. Emax = kV/m μT Bmax = (e) Assuming that this pulsed beam strikes an absorbing surface, compute the force exerted on the surface during the 1.00-ns duration of each pulse. μνarrow_forward(a) Two microwave frequencies are authorized for use in microwave ovens, 885 and 2545 MHz. Calculate the wavelength (in cm) of each. cm (frequency = 885 MHz) cm (frequency = 2545 MHz) (b) Which frequency (in MHz) would produce smaller hot spots in foods due to interference effects? MHzarrow_forwardEstimate how long an AM antenna would have to be if it were (a) A or (b)A. AM radio is roughly 1 MHz (530 kHz to 1.7 MHz).arrow_forward
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