College Physics, Volume 1
11th Edition
ISBN: 9781337653329
Author: Raymond A. Serway; Chris Vuille
Publisher: Cengage Learning US
expand_more
expand_more
format_list_bulleted
Concept explainers
Question
Chapter 28, Problem 51AP
(a)
To determine
The power per unit area at the retina.
(b)
To determine
The energy delivered to per pulse to an area of molecular size.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
A laser used in eye surgery emits a 3.00-mJ pulse in 1.00 ns, focused to a spot 30.0 µm in diameter on the retina. (a) Find (in SI units) the power per unit area at the retina. (This quantity is called the irradiance.) (b) What energy is delivered per pulse to an area of molecular size (say, a circular area 0.600 nm in diameter)?
A laser used in eye surgery emits a 3.60-mJ pulse in 1.00 ns, focused to a spot 45.0 µm in diameter on the retina.
(a) Find (in SI units) the power per unit area at the retina. (This quantity is called the irradiance.)_________ W/m2(b) What energy is delivered per pulse to an area of molecular size (say, a circular area 0.400 nm in diameter)?___________ J
A regular LED light bulb continuously emits 10.0 W of light uniformly in all directions. A man stands so that
his eyes are 5.00 m away from this light bulb and he is looking directly at the light bulb. There are no other
sources of light in this room. (a) What is the irradiance of this light in W/m2 just before entering this man's
eyes? (b) If each pupil of this man is contracted to a radius of 2.00 mm, what is the total power in W of the
light entering each eye? (c) A human receives 3300 J of usable energy after eating one blueberry. How long
would this man have to stare at this light bulb in order to take into his eyes through the pupils the same
amount of energy as eating a blueberry? Don't forget that he has two eyes! (Note that far more energy from
the light is hitting his skin, but that is not what we care about here.)
Chapter 28 Solutions
College Physics, Volume 1
Ch. 28.3 - Prob. 28.1QQCh. 28.4 - Prob. 28.2QQCh. 28.5 - Prob. 28.3QQCh. 28 - Prob. 1CQCh. 28 - Prob. 2CQCh. 28 - Prob. 3CQCh. 28 - Prob. 4CQCh. 28 - Prob. 5CQCh. 28 - Prob. 6CQCh. 28 - Prob. 7CQ
Ch. 28 - Prob. 8CQCh. 28 - Prob. 9CQCh. 28 - Prob. 10CQCh. 28 - Prob. 11CQCh. 28 - Prob. 12CQCh. 28 - Prob. 13CQCh. 28 - Prob. 14CQCh. 28 - Prob. 15CQCh. 28 - Prob. 1PCh. 28 - Prob. 2PCh. 28 - Prob. 3PCh. 28 - Prob. 4PCh. 28 - Prob. 5PCh. 28 - Prob. 6PCh. 28 - Prob. 7PCh. 28 - Prob. 8PCh. 28 - Prob. 9PCh. 28 - Prob. 10PCh. 28 - Prob. 11PCh. 28 - Prob. 12PCh. 28 - Prob. 13PCh. 28 - Prob. 14PCh. 28 - Prob. 15PCh. 28 - Prob. 16PCh. 28 - Prob. 17PCh. 28 - Prob. 18PCh. 28 - Prob. 19PCh. 28 - Prob. 20PCh. 28 - Prob. 21PCh. 28 - Prob. 22PCh. 28 - Prob. 23PCh. 28 - Prob. 24PCh. 28 - Prob. 25PCh. 28 - Prob. 26PCh. 28 - Prob. 27PCh. 28 - Prob. 28PCh. 28 - Prob. 29PCh. 28 - Prob. 30PCh. 28 - Prob. 31PCh. 28 - Prob. 32PCh. 28 - Prob. 33PCh. 28 - Prob. 34PCh. 28 - Prob. 35PCh. 28 - Prob. 36PCh. 28 - Prob. 37PCh. 28 - Prob. 38PCh. 28 - Prob. 39PCh. 28 - Prob. 40PCh. 28 - Prob. 41PCh. 28 - Prob. 42PCh. 28 - Prob. 43PCh. 28 - Prob. 44PCh. 28 - Prob. 45PCh. 28 - Prob. 46APCh. 28 - Prob. 47APCh. 28 - Prob. 48APCh. 28 - Prob. 49APCh. 28 - Prob. 50APCh. 28 - Prob. 51APCh. 28 - Prob. 52APCh. 28 - Prob. 53APCh. 28 - Prob. 54AP
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 light beam of wavelength λ= 500 nm, beam diameter 5 mm and intensity I is propagating in a medium. The absorption cross section of the medium is 2.3×10-19 cm-2 and upper-level lifetime is 10 µs. Calculate the power of the light beam that make the absorption coefficient of the medium (α) decays to 50% of its initial value (αo).arrow_forwardof 0.6 W per pulse. If the wavelength of the laser light is 60 nm. (a) how much energy is deposited per pulse and (b) how many photons does each pulse contain? 7. Light from a 2.5 mW laser source of aperture diameter 1.8 cm and A-5000 Å is focused by a lens of focal length 20 cm. Calculate the area and intensity of the image.arrow_forwardA laser used in eye surgery emits a 3.00 - mJ pulse in 1.00 ns, focused to a spot 30.0 mewm in diameter on the retina. (a) Find (in SI units) the power per unit area at the retina. (This quantity is called the irradiance.) (b) What energy is delivered per pulse to an area of molecular size (say, a circular area 0.600 nm in diameter)?arrow_forward
- each pulse produced by an argon-fluoride excimer laser used in PRK and LASIK ophthalmic surgery lasts only 10.0ns but delivers an energy of 2.50mJ. (a) what is the power produced during each pulse? (b) if the beam has a diameter of 0.850mm, what is the average instenisty of the beam during each pulse? (c) if the laser emits 55 pulses per second, what is the average power it generates?arrow_forward(a) How many minutes does it take a photon to travel from the Sun to the Earth? min (b) What is the energy in ev of a photon with a wavelength of 478 nm? ev (c) What is the wavelength (in m) of a photon with an energy of 1.03 eV?arrow_forwardWhen a powerful laser is employed in the Earth's atmosphere, the accompanying electric field may ionize the air, transforming it into a plasma that reflects the laser light. Electric breakdown occurs in dry air at 0°C and 1 atm when field amplitudes above around 3:00 Mv/m a). At this maximum intensity, how much Power can a cylindrical beam with a diameter of 4.03 mm deliver? Note Answer must be in W.arrow_forward
- The National Ignition Facility (NIF), which became operational in 2009, uses 192 laser beams to stimulate nuclear fusion in a deuterium-tritium fuel pellet. The net output of the lasers is 1.8 MJ of 351-nm light, delivered in a brief (4.0-ns) pulse. (a) What is the average power delivered during the pulse? Compare your answer with the average power consumption in the United States, about 3 x 1012 W. (b) How many photons are produced in each pulse?arrow_forwardThe x-ray linear attenuation coefficient of water at 40 keV is ?????? = 0.27 ??−1.The CT number of a tumor reported by a CT scanner is 60 HU. Calculate the linear attenuation coefficient of the tumor tissue ?arrow_forwardThe light that plants absorb to perform photosynthesis has a wavelength that peaks near 675 nm. Express thisdistance in (a) millimeters and (b) inches.arrow_forward
- Each pulse produced by an argon–fluorideexcimer laser used in PRK and LASIK ophthalmic surgery lasts only10.0 ns but delivers an energy of 2.50 mJ. (a) What is the powerproduced during each pulse? (b) If the beam has a diameter of0.850 mm, what is the average intensity of the beam during eachpulse? (c) If the laser emits 55 pulses per second, what is the average power it generates?arrow_forwardAn ultrafast laser produces pulses of 75 fs duration at a rate of 2.3 kHz and a total average power of 103 mW. For an individual laser pulse, calculate the following. (a) the length in meters 4.9 772.5e-17 X m (b) the energy in joules 4.0 41.2e-6 X J (c) the peak power in watts 4.0 5.44e-8 X Warrow_forward(a) If the power output of a 670 kHz radio station is 49.0 kW, how many photons per second are produced? 1.1679e32 X How does power relate to energy? Review the relationship between energy and frequency of a photon. photons/s (b) If the radio waves are broadcast uniformly in all directions, find the number of photons per second per square meter at a distance of 125 km. Assume no reflection from the ground or absorption by the air. 2.138e21 If there is no reflection by the ground, what fraction of the radiated power reaches the receiver? What portion of the spherical surface do you need to consider here? photons/(s · m2) Additienel Mete nielarrow_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
Principles of Physics: A Calculus-Based Text
Physics
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Cengage Learning