Nwne _ Hour _ I. True or false? William Herschel determined that the temperature of colors of light was higherat the blueend and lower at the red end.2. Herschel's curiosity led him to conc\lJde there must be invisible - ·beyondthe red endoftbe color band. .3. True or false? The full range of frequencies of electromagnetic radiation is called the electromagneticspeetrum.. .4. Name each kind of wave in the electromagnetic spectrum, from the longest to shortest 'Wavelength.a: b. c.~ ~ £Radio Waves (pages 540-5~2)5. Circle the 3 letters of each way that radio waves might be used. ., a. x-ray machines b. microwave ovens c. radio technology d. television technology6. \Iv'llat is the difference between amplitude modulation {AM) and fi:eq'llen.cymodulation (FM)?

Section 18.1 Electromagnetic Waves {pages 532-538}This section describes the characteristics of electromagnetic waves.What Are Electromagnetic Waves? (page 533)1. What are electromagnetic waves?

2. Electric fields are produced by electrically charged particles and by changin.~g_-:-:---,,,.--:--._3. ?vIagnetic fields are produced by magnets, by changing • and by vibrating charges.4. Electromagnetic waves are prodll(ed when a(n) vibrates or accelerates.5. Circle the 3 letters of each sentence that is true about electric and magnetic fields.

a. An electromagnetic wave occurs when electric and magnetic fields vibrate at right angles to each other.b. A magnetic field is sl1t!ounded by an electric currentc. Changing electric and magnetic fields regenerate each other.d. Electromagnetic waves are produced when an electric charge vibrates.

6, True or false? Electromagnetic waves need a medium to travel through.7. The transfer of energy by electromagnetic waves traveling through matter or across space is called

7. How far do microwaves generally penetrate food?A. Several feet B. Several millimeters C. Several centimeters

. 8. How is the Doppler effect used to detect the speed of a vehicle?._ Infrared Rays (page 543)The Speed of Electromagnetic Waves (page 534) 9. Circle the3 letters. of each way infrared ta~ are used. .g, As a thunderstorm approaches, you see the lightning before you hear the thunder, because light travels a. source ofhght b. to ~scover areas of heat d~erences(faster Islower) than sound. c. source of heat .. '. d. to discover areas ofdepth differences. . '".1 .9, True or false? An electromagnetic waves travel at the same speed through a vacuum. 10. Thermograms show vanations in _ and are used to find places whete a bmldin", loses10. Circle the letter that gives me correct speed of light in a vacuum. heat to the environment.a. 3.00 X lOskilometers per second b. 3.00 X lO!meters per hour c. 3.00 X lOsmeters per second Visible Ught {page 543)d. 3.00 X 10skilometers per hOUT e. 186,000 miles per second 11. True or false? One use for visible light is to help people communicate with one another.Wavelength and Frequency (page 535) Ultraviolet Rays (pag~ 544)11. Circle the 2 letters of tile sentences that is true about electromagnetic waves. 12. Ultraviolet radiation has applications in and _

a. Different electromagnetic waves can have different frequencies. 13. True or false? Ultraviolet radiation helps your skin produce vitamin D.b.Wave1ength is ~proportional to frequency. . : X-rays (page 544)c. Electromagnetic ~ves always travel at the speed o~light. • 14. True or false? X-rays have higher frequencies than ulttaviolet ra),'S.d. All electromagnetic waves lravel at the same speed in a vacuum. 15. Why arc X-rays helpful?

12. As the ':'aV~lengths of electromagnetic waves increase, the frequencies (Increase I DecrUlSe )1 for Gamma Rays (page 545)waves moving m a.vacuum. 16. Gamma rays have the highest and therefore the most __ ~_.Wave or Part.lela? ~pliges536-537). . ..' the greatest penetrating ability of all the electromagnetic waves,13. Electromagnetic radiation behaves sometimes like a(n) and, sometimes like a stream of 17. How is gamma radiation used in medicine?

D. Several fuiers

and

14.Il1tenerenceonlyoccurswhentwoormorewavesoverlilP,soYoung'sexperimentshowedthatlight . S t" 183 B havl f Ll ht -behaves like a: . ec Ion • e aVlor 0 Ig (pages 546-549)15. The emission of electrons from a,metal caused by light striking the metal is called the effect.' This section discusses the behavior of light when it strikes dijJerimt types of materials.16. Blue light ~ a higher frequency than red light, so photons of blue light have (less I more) energy than Light and Materials (pages 54i-G47)photons ~fred light. 1. True or false? Without light, nothing is viSIble.IntenSity (pave US) . Match each term to its dejlllitiol'_17. The c1~e: you get to a source of'Iight, the the light appears. Term 'Definitlon . ..18. Intensity IS the at which a wave's energy flows through a given unit of area. _2. transparent A. Material that absorbs or reflects all of the light that strikes It

19. As photons travel feIlher from the source, the of light decreases. 3. opaque B. Material that transmits lightSection 18.2 The Electromagnetic Spectrum (pages 539-545) __ 4. translucen! C. Material that scatters lightThis section identifies the waves in the electromagnetic spectrum and describes their uses. Separa.tlng White ~Ight !nto C~lors .(pa~.551)The Waves of the Spectrum ( 5311-540)' . 1. What did Isaac Newton .s e~penments WIth a prism ~ 1666 show?

pages . 2. What happens when white light passes through a pnsm?

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