physics 238 - chapter 22.pdf

3/24/2015 Physics 238 Chapter 22

http://www.webassign.net/web/Student/AssignmentResponses/last?dep=10978948 1/4

Current Score : 18 / 20 Due : Tuesday, May 12 2015 11:59 PM CDT

1. 1/1 points | Previous AnswersSerCP10 22.P.001.

During the Apollo XI Moon landing, a retroreflecting panel was erected on the Moon's surface. Thespeed of light can be found by measuring the time it takes a laser beam to travel from Earth,reflect from the panel, and return to Earth. If this interval is found to be 2.51 s, what is themeasured speed of light? Take the centertocenter distance from Earth to Moon to be

3.84 ✕ 108 m. Assume that the Moon is directly overhead and do not neglect the sizes of the Earth

and Moon. (Assume the radius of the Earth and the Moon are 6380 km and 1740 km respectively.)2.995*10**8 m/s


(a) What is the energy in joules of an xray photon with wavelength 1.94 ✕ 10−10 m?

1.025*10**15 J

(b) Convert the energy to electron volts.6.407 keV

(c) If more penetrating xrays are desired, should the wavelength be increased or decreased?

(d) Should the frequency be increased or decreased?

Physics 238 Chapter 22 (Homework)

Adel BamakhishPhysics 238, section 01, Spring 2015Instructor: C.J. Tymczak

WebAssign

increased

decreased

increased

decreased



3. 2/2 points | Previous AnswersSerCP10 22.P.003.MI.FB.

Find the energy of the following. Express your answers in units of electron volts, noting that

1 eV = 1.60 1019 J.

(a) a photon having a frequency of 9.00 1017 Hz3729.37 eV

(b) a photon having a wavelength of 4.20 102 nm2.95 eV

4. 2/2 points | Previous AnswersSerCP10 22.P.008.WI.

The two mirrors in the figure below meet at a right angle. The beam of light in the vertical planeP strikes mirror 1 at θ1 = 32.0° as shown.

(a) Determine the distance the reflected light beam travels before striking mirror 2. 2.35 m

(b) In what direction does the light beam travel after being reflected from mirror 2? 58 ° above the horizontal



5. 1/1 points | Previous AnswersSerCP10 22.P.028.WI.

A certain kind of glass has an index of refraction of 1.660 for blue light of wavelength 440 nm andan index of 1.620 for red light of wavelength 690 nm. If a beam containing these two colors isincident at an angle of 30.0° on a piece of this glass, what is the angle between the two beamsinside the glass? 0.44 °


The index of refraction for red light in water is 1.331 and that for blue light is 1.340. If a ray ofwhite light enters the water at an angle of incidence of 67.50°, what are the underwater angles ofrefraction for the blue and red components of the light? (Enter your answers to at least twodecimal places.)

(a) blue component 43.58 °

(b) red component 43.95 °


For light of wavelength 589 nm, calculate the critical angles for the following substances whensurrounded by air.

ethyl alcohol 47.33 °

fluorite 44.37 °

sodium chloride 40.36 °


For light of wavelength 589 nm, calculate the critical angles for the following substances whensurrounded by water.

water 90 °

glycerine 64.54 °

diamond 33.35 °




Determine the maximum angle θ for which the light rays incident on the end of the light pipe inthe figure below are subject to total internal reflection along the walls of the pipe. Assume thelight pipe has an index of refraction of 1.37 and the outside medium is air.69.46 °

10.1/1 points | Previous AnswersSerCP10 22.P.045.

A layer of ice having parallel sides floats on water. If light is incident on the upper surface of theice at an angle of incidence of 36.6°, what is the angle of refraction in the water? 26.63 °

physics 238 - chapter 22.pdf

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