BIO UV
Want to see the full answer?
Check out a sample textbook solutionChapter 25 Solutions
Physics (5th Edition)
Additional Science Textbook Solutions
University Physics (14th Edition)
College Physics
Sears And Zemansky's University Physics With Modern Physics
College Physics
Glencoe Physical Science 2012 Student Edition (Glencoe Science) (McGraw-Hill Education)
Life in the Universe (4th Edition)
- A particle of cosmic dust has a density =2.0g/cm3 , (a) Assuming the dust particles are spherical and light absorbing, and are at the same distance as Earth from the Sun, determine the particle size for which radiation pressure from sunlight is equal to the Sun's force of gravity on the dust particle, (b) Explain how the forces compare if the particle radius is smaller, (c) Explain what this implies about the sizes of dust particle likely to be present in the inner solar system compared with outside the Oort cloud.arrow_forwardLunar astronauts placed a reflector on the Moon's Surface, off which a laser beam is periodically reflected. The distance to the Moon is calculated from the round-trip time. (a) To what accuracy in meters can the distance to the Moon be determined, if this time can be measured to 0.100 ns? (b) What percent accuracy is this, given the average distance to the Moon is 3.84108m ?arrow_forward(a) What is the wavelength of a 1.00-eV photon? (b) Find its frequency in hertz. (c) Identify the type of EM radiation.arrow_forward
- What 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_forwardProfessor Edward Ney was the founder of infrared astronomy at the University of Minnesota. In his later years, he wore an artificial pacemaker. Always an experimentalist, Ney often held a strong laboratory magnet near his chest to see what effect it had on his pacemaker. Perhaps he was using the magnet to throw switches that control different modes of operation. An admiring student (without an artificial pacemaker) thought it would be fun to imitate this great man by holding a strong magnet to his own chest. The natural pacemaker of the heart (known as the sinoatrial node) carries a current of about 0.5 mA. Estimate the magnetic force exerted on a natural pacemaker by a strong magnet held to the chest. How do you think the student might have felt during the experiment? Explain your geometric assumptions. Hints: See Table 30.1 (page 941) to estimate the magnetic field, and assume the field is roughly uniform. Use Figure P30.58 to estimate the size of the sinoatrial node; your heart is about the size of your fist. FIGURE P30.58arrow_forward41 UV radiation is utilized in a range of industrial operations as well as medical and dental treatments for a variety of purposes, including destroying bacteria, creating fluorescent effects, curing inks and resins, phototherapy, and suntanning. UV wavelengths and intensities are employed for a variety of applications. Which of the following would take place when you increase the frequency of an ultraviolet light? The wavelength of the UV radiation would increase. The speed of the UV radiation would increase. The wavelength of the UV radiation would be the same. The speed of the UV radiation would be the same.arrow_forward
- (1) Ge... an A v google - Yahoo Search Results Submit: Previous Answers Correct Estimate the radiation pressure due to a bulb that emits 25 W of EM radiation at a distance of 7.5 cm from the center of the bulb. Assume that light is completely absorbed. Express your answer to two significant figures and Include the appropriate units. P = 1.2x10-6 N Part B HA Estimate the force exerted on a fingertip at this point. Suppose that the area of the fingertip is 1.3 cm². Assume that light is completely absorbed. Express your answer to two significant figures and includ the appropriate units. F = 1.6 10 <-10 N Submit Previous Answers Request Answer y pearson login - Yahoo Search Results Yahoo Sear... ? X Incorrect; Try Again; 3 attempts remaining Course Home P Pearson Copyright © 2022 Pearson Education Inc. All rights reserved. | Terms of Use | Privacy Policy Permissions | Contact Us |arrow_forwardLaser Safety A 0.95 mW laser emits a narrow beam of light that enters the eye. d=5.0 um c. Damage to the retina can occur if the average intensity of light exceeds 1.0×10−2W/cm2. By what factor has the intensity of this laser beam exceeded the safe value?arrow_forwardGround control for an experimental solar sail notices that as the ship moves away from the sun the average electric field incident on the sail has decreased by a factor of two. By how what factor does the radiation pressure exerted on the sail decrease? a) √2 b) 2 c) 4 d)16 e) none of these are correctarrow_forward
- EM radiation has an average intensity of 2200 W/m2. Which of the following statements about the E or B fields in this radiation is correct? a. Emax = 910.3 N/C b. Erms = 1020.1 N/C c. Brms = 3.03 x 10-6 T d. Bmax = 6.06 x 10-6 Tarrow_forwardEstimate the radiation pressure due to a 75 W bulb at a distance of 7.8 cm from the center of the bulb. Express your answer to two significant figures and include the appropriate units. ? Prad = Value Units Estimate the force exerted on your fingertip if you place it at this point. Assume that the area of a fingertip is 1.3 cm? Express your answer to two significant figures and include the appropriate units. | ? F = Value Unitsarrow_forwardExplain why x-rays are more harmful than infrared waves in medical imaging.arrow_forward
- Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage LearningPrinciples of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningCollege PhysicsPhysicsISBN:9781938168000Author:Paul Peter Urone, Roger HinrichsPublisher:OpenStax College
- Physics for Scientists and Engineers, Technology ...PhysicsISBN:9781305116399Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning