College Physics: A Strategic Approach (3rd Edition)
3rd Edition
ISBN: 9780321879721
Author: Randall D. Knight (Professor Emeritus), Brian Jones, Stuart Field
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Concept explainers
Question
Chapter 15, Problem 14CQ
a.
To determine
The intensity, if a lens focuses the laser beam to
1 10
b.
To determine
The intensity if the beam defocuses the laser beam to 10 times its initial diameter.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
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 beam with a wavelength of 193 nm. Each laser pulse lasts 15 ns and contains 1.0 mJ of light energy.a. What is the power of one laser pulse?b. During the very brief time of the pulse, what is the intensity of the light wave?
A laser beam has intensity I0.a. What is the intensity, in terms of I0, if a lens focuses the laser beam to 1/10 its initial diameter?b. What is the intensity, in terms of I0, if a lens defocuses the laser beam to 10 times its initial diameter?
Fog can greatly reduce the intensity of oncoming headlights. The distance, d, in metres, of an oncoming car whose headlights have an intensity of light, I, in lumens (lm), is given by ? = −167log(1/125).
a. How far away is a car whose headlight intensity is 50lm?
b. If an oncoming car is 30m away, what is the intensity of its headlights?
c. If the headlight intensity doubles, does this mean the car is half as far away? Explain.
Chapter 15 Solutions
College Physics: A Strategic Approach (3rd Edition)
Ch. 15 - a. In your own words, define what a transverse...Ch. 15 - a. In your own words, define what a longitudinal...Ch. 15 - Is it ever possible for one sound wave in air to...Ch. 15 - A wave pulse travels along a string at a speed of...Ch. 15 - Harbor seals, like many animals, determine the...Ch. 15 - A thermostat on the wall of your house keeps track...Ch. 15 - When water freezes, the density decreases and the...Ch. 15 - Figure Q15.9 Q shows a history graph of the motion...Ch. 15 - Figure Q15.10 Q shows a history graph and a...Ch. 15 - Prob. 11CQ
Ch. 15 - Bottlenose dolphins use echolocation pulses with a...Ch. 15 - Some bat species have auditory systems that work...Ch. 15 - Prob. 14CQCh. 15 - When you want to snap a towel, the best way to...Ch. 15 - The volume control on a stereo is designed so that...Ch. 15 - A bullet can travel at a speed of over 1000 m/s....Ch. 15 - Prob. 19CQCh. 15 - Denver, Colorado, has an oldies station that calls...Ch. 15 - What is the frequency of blue light with a...Ch. 15 - Ultrasound can be used to deliver energy to...Ch. 15 - A sinusoidal wave traveling on a string has a...Ch. 15 - Two strings of different linear density are joined...Ch. 15 - You stand at x = 0 m, listening to a sound that is...Ch. 15 - The wave speed on a string under tension is 200...Ch. 15 - The wave speed on a string is 150 m/s when the...Ch. 15 - The back wall of an auditorium is 26.0 m from the...Ch. 15 - A hammer taps on the end of a 4.00-m-long metal...Ch. 15 - In an early test of sound propagation through the...Ch. 15 - Prob. 6PCh. 15 - An earthquake 45 km from a city produces P and S...Ch. 15 - A stationary boat in the ocean is experiencing...Ch. 15 - Figure P15.9 Q is a snapshot graph of a wave at t...Ch. 15 - Figure P15.10Q is a snapshot graph of a wave at t...Ch. 15 - Figure P15.11 is a history graph at x = 0 m of a...Ch. 15 - A sinusoidal wave has period 0.20 s and wavelength...Ch. 15 - A sinusoidal wave travels with speed 200 m/s. Its...Ch. 15 - The motion detector used in a physics lab sends...Ch. 15 - The displacement of a wave traveling in the...Ch. 15 - A traveling wave has displacement given by y(x, t)...Ch. 15 - Figure P15.18 is a snapshot graph of a wave at t =...Ch. 15 - Figure P15.19 is a history graph at x = 0 m of a...Ch. 15 - A boat is traveling at 4.0 m/s in the same...Ch. 15 - In the deep ocean, a water wave with wavelength 95...Ch. 15 - People with very good pitch discrimination can...Ch. 15 - A dolphin emits ultrasound at 100 kHz and uses the...Ch. 15 - a. What is the wavelength of a 2.0 MHz ultrasound...Ch. 15 - Prob. 25PCh. 15 - Prob. 26PCh. 15 - Prob. 27PCh. 15 - Prob. 28PCh. 15 - Sound is detected when a sound wave causes the...Ch. 15 - At a rock concert, the sound intensity 1.0 m in...Ch. 15 - Prob. 31PCh. 15 - Prob. 32PCh. 15 - A large solar panel on a spacecraft in Earth orbit...Ch. 15 - Prob. 34PCh. 15 - LASIK eye surgery uses pulses of laser light to...Ch. 15 - At noon on a sunny day, the intensity of sunlight...Ch. 15 - Prob. 37PCh. 15 - What is the sound intensity level of a sound with...Ch. 15 - What is the sound intensity of a whisper at a...Ch. 15 - You hear a sound at 65 dB. What is the sound...Ch. 15 - The sound intensity from a jack hammer breaking...Ch. 15 - A concert loudspeaker suspended high off the...Ch. 15 - A rock band playing an outdoor concert produces...Ch. 15 - Your ears are sensitive to differences in pitch,...Ch. 15 - 30 seconds of exposure to 115 dB sound can damage...Ch. 15 - A woman wearing an in-ear hearing aid listens to a...Ch. 15 - An opera singer in a convertible sings a note at...Ch. 15 - An ospreys call is a distinct whistle at 2200 Hz....Ch. 15 - A whistle you use to call your hunting dog has a...Ch. 15 - An echocardiogram uses 4.4 MHz ultrasound to...Ch. 15 - Prob. 51PCh. 15 - While anchored in the middle of a lake, you count...Ch. 15 - A Doppler blood flow unit emits ultrasound at 5.0...Ch. 15 - A train whistle is heard at 300 Hz as the train...Ch. 15 - Oil explorers set off explosives to make loud...Ch. 15 - A 2.0-m-long string is under 20 N of tension. A...Ch. 15 - A female orb spider has a mass of 0.50 g. She is...Ch. 15 - A spider spins a web with silk threads of density...Ch. 15 - In 2003, an earthquake in Japan generated 1.1 Hz...Ch. 15 - Prob. 60GPCh. 15 - An earthquake produces longitudinal P waves that...Ch. 15 - Figure P15.62 Q shows two snapshot graphs taken 10...Ch. 15 - Low-frequency vertical oscillations are one...Ch. 15 - A wave on a string is described by y(x, t) = (3.0...Ch. 15 - Write the y-equation for a wave traveling in the...Ch. 15 - Write the y-equation for a wave traveling in the...Ch. 15 - A wave is described by the expression y(x, t) =...Ch. 15 - A point on a string undergoes simple harmonic...Ch. 15 - a. A typical 100 W lightbulb produces 4.0 W of...Ch. 15 - Prob. 70GPCh. 15 - A dark blue cylindrical bottle is 22 cm high and...Ch. 15 - Assume that the opening of the ear canal has a...Ch. 15 - The sound intensity 50 m from a wailing tornado...Ch. 15 - One of the loudest sound generators ever created...Ch. 15 - A harvest mouse can detect sounds below the...Ch. 15 - Prob. 76GPCh. 15 - A physics professor demonstrates the Doppler...Ch. 15 - When the heart pumps blood into the aorta, the...Ch. 15 - Although we cant hear them, the ultrasonic pulses...Ch. 15 - Bats are sensitive to very small changes in...Ch. 15 - Some bats have specially shaped noses that focus...Ch. 15 - Some bats utilize a sound pulse with a rapidly...
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- A microwave source produces pulses of 20.0GHz radiation, with each pulse lasting 1.00 ns. A parabolic reflector with a face area of radius 6.00 cm is used to focus the microwaves into a parallel beam of radiation as shown in Figure P34.60. The average power during each pulse is 25.0 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. (d) Determine the amplitude of the electric and magnetic fields in these microwaves. (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. Figure P34.60arrow_forwardE1ecmagnedc radiation from a 5.00-mW laser is concentrated on a 100-mm2 area. (a) What is the intensity in W/m2? (b) Suppose a 2.00-nC electric charge is in the beam. What is the maximum electric force it experiences? (C) If the electric charge moves at 400 m/s, what maximum magnetic force can it feel?arrow_forwardWhat is the frequency of the blue-violet light of wavelength 405 nm emitted by the laser-reading heads of Blu-ray disc players?arrow_forward
- A certain microwave oven projects 1.00 kW of microwaves onto a 30-cm-by-40-cm area. (a) What is its intensity in W /m2? (b) Calculate the maximum electric field strength E0in these waves. (c) What is the maximum magnetic field strength B0?arrow_forward(a) The ideal size (most efficient) for a broadcast antenna with one end on the ground is one-fourth the wavelength (/4) of the electromagnetic radiation being sent out. If a new radio station has such an antenna that is 50.0 m high, what frequency does it broadcast most efficiently? Is this in the AM or FM band? (b) Discuss the analogy of the fundamental resonant mode of an air column closed at one end to the resonance of currents on an antenna that is one-fourth their wavelength.arrow_forward3.10 The earth is 146.9 million km from the sun, and receives light with an intensity of 1.36 kW/m2. Mars is 227.9 million km from the sun. a. Calculate the intensity of sunlight for a satellite that is in the vicinity of Mars. b. If the satellite has solar cells with an efficiency of 29%, what area is required to generate 1 kW of electrical power?arrow_forward
- Problem 1. A geostationary satellite is located 36,000 kilo- meters (km) away from the surface of the Earth. Once a minute it takes a digital picture and transmits the data to a base station on Earth. The rate of transmission is 10 Mbps and the propogation speed is 3.0 × 108 m/s. You may assume the actual time required to take the picture is negligible. a. What is the propagation delay of the link? b. The bandwidth-delay product is defined to be Rxdprop where dprop is the propagation delay. Calculate the bandwidth-delay product Rxdprop where deprop is the propagation delay. c. Let x denote the size of the picture in bits. What is the minimum value for x so that the satellite is continuously transmitting data over the link?arrow_forwardUsing a dish-shaped mirror, a solar cooker concentrates the sun’s energy onto a pot for cooking. A cookerwith a 1.7-m-diameter dish focuses the sun’s energy onto a pot with a diameter of 25 cm. Given that the intensity of sunlight is about 1000 W/m2,a. How much solar power does the dish capture?b. What is the intensity at the base of the pot?arrow_forwardBiologists use optical tweezers to manipulate micron-sized objects using a beam of light. In this technique, a laser beam is focused to a very small-diameter spot. Because small particles are attracted to regions of high light intensity, the focused beam can be used to “grab” onto particles and manipulate them for various experiments. In one experiment, a 10 mW laser beam is focused to a spot that has a diameter of 0.62 μm.a. What is the intensity of the light in this spot?b. What is the amplitude of the electric field?arrow_forward
- A plane wave of light that propagates in vacuum in the x-direction obeys the following function: E(x, t) = (2,000 N/C)sin[(1.26 x 107m-1) − (3.14 x 1015 rad/s)t]. What is the speed of the light wave? a. 3.00 x 108 m/s b. 2.49 x 108 m/s c. 2.13 x 108 m/s d. 1.25 x 108 m/s e. 1.84 x 108 m/sarrow_forwardLASIK eye surgery uses pulses of laser light to shave off tissue from the cornea, reshaping it. A typical LASIK laser emits a 1.0-mmmm-diameter laser beam with a wavelength of 193 nmnm. Each laser pulse lasts 13 nsns and contains 1.1 mJmJ of light energy. What is the power of one laser pulse? During the very brief time of the pulse, what is the intensity of the light wave?arrow_forwardIf two light rays one has wavelength A = 680 nm and the other one has wavelength опе 2=530 nm. 6. a) Which light rays travels a smaller distance in 1 second? Explain. b) Which light rays has the smaller frequency? Explain.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Principles of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning
Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage Learning
Physics for Scientists and Engineers, Technology ...PhysicsISBN:9781305116399Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning
Principles of Physics: A Calculus-Based Text
Physics
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Cengage Learning
Physics for Scientists and Engineers: Foundations...
Physics
ISBN:9781133939146
Author:Katz, Debora M.
Publisher:Cengage Learning
Physics for Scientists and Engineers, Technology ...
Physics
ISBN:9781305116399
Author:Raymond A. Serway, John W. Jewett
Publisher:Cengage Learning