1. Which of the following sentences describes the electric and ma...

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1. Which of the following sentences describes the electric and magnetic field components of an electromagnetic wave? * 1 pair The changes in their magnitudes are equal. The changes in their magnitudes are unrelated. They are parallel to the direction of wave propagation. They are perpendicular to the direction of wave propagation. In a Michel on-type experirnent, the path followed by a bean1 of light when the 8-sided r11irror is at rest is a shown below. Tl1e detector indicates a maximum signal. As the 8-sided mirror begins to rotate, the beam of light no longer follows this path, and the detector ir1dicates a decreased sigr1al. • Light source Path of I ight bcan1 Stationary ffillTOf - ------30.0 kn1 ------- 8-sided rotaLing mirror Light detector Note: This diagran, is not drawn to cale. Once the 8-sided mirror is rotating, the frequency of rotation for which the detector will first indicate a maximun, signal is 6.25 x 102 revolutions per second 1.25 x 103 revolutions per second 5.00 x 103 revolutions per second 1.00 x 104 revolutions per second A ray of light passes from a less dense n1ediu1n to a n1ore dense n1e<liu1n, as sho\vn. Which of the follo\ving best describes \vhat happens? Reflected Ray Wavelength of refracted ray A. Exists Decreases B. Exis t~ Increases C. Does not exist Decreases D. Docs not exist Increases A B C D A group of tudents conduct a series of tests to determine which combination of optical media results in tl1e largest critical a11gle for one wavelength of visible light. The table below lists the index of refraction for each of the media used. ,~ - Index of Refraction Medium for this Wavelength Used of Visible J_,ight Water 1.33 Glass 1.46 Quartz 1.54 Flint Gia s 1.70 The largest cri tical angle for this wavelength of visible light \viii be produced for the path fro1n glass to quartz quartz to glass water to flint glass flint glass to water Visible light that has a wavelength of 6.00 x 10-7 1n in air is directed into fused quartz. The index of refraction of fu. ed quartz i 1.46. The wavelength of this light inside the fused quartz, expressed in scientific notation, 1. _____ x 10-"' m. Students u_ c a green la. er poi nter and an optical apparatu_ to produce nn interference pattern on a ruler, a-; sho,vn below. r 'fPM'"P,11 . I 2 3 4 0 7 • fJRr,~.,,• ,,11p Yf 14 I 18 17 •• It 21 ~ 23 24 2t V 211 211 0cm 5 15 20 25 30 The ruler i 50.0 c1n f ron1 the optical apparatu and the ,vavelength of the green laser I ight i 557 nn1. The ·1udents analyze the ob·ervation · and calculate . the distance bet,veen adjacent opening . /11 order for tl,e st11de11ts' a11aJ.rsis to prod11ce tire n1ost acct1rate calc11/ated i·al11e of the clistance, d. betli·ee11 rlre adjace11t ope11i11gs, tire)' n1easure x, tl1e <lisra11ce Jro,n rhe ce11tral 111a:ri111111n ro tire i order 111a~ri111111n. Tl1e eq11atio11 r/1at the)' 11se is ii c111cl rl1e ,1c1/11e rhc,t t/1e_r get i.s i ii The statement above are completed by the infor1nation in row The statements above are con1pleted by the information in ro\v Ro,v • • • • • • l ll Ill xcl A. fir t 11.- -~ 4.29 X 10-6 ffi - 11/ I B. fir t A.= d in0 4.32 X 10-6 ffi 11 C. fourth 11. - :rd_ - 11/ 3.90 X 10-6 m D. fotJrth ?.. = d sin0 4.49 X 10-6 m 11 A B C D Students use various appa ratus to investigate optical phenornena. During their investigations, they make the following eight observations. Observations 1 The apparatus produces a continuous spectrum with \Vrute light. 2 The apparatus produces a bright-line spectrum with \vhite light. 3 The apparatus produces an interference pattern with monochromatic light. 4 The apparatu produce a single bright line v, ith rnonochrornatic light.. 5 The apparatus bends red light through a smaller angle than it bends blue light. 6 The apparatu bend red light through a larger angle than it bend blue light. 7 The apparatus produce a single pecnu1n when ,vhite light is incident perpendicular to the apparatus. 8 The apparatus produces rnu ltiple spectra when whi te light i incident perpendicular to the apparatus. Four observations that could be produced using only a o-iangu lar glass pris rn are nurnbered ______ , __ , and __ _ 1. The critical angle for a liquidair interface is 28°. a) Sketch a ray diagram illustrating this situation. b) Determine the time it takes for light to travel through 7.5 km of the liquid. * A group of tudent i given a low-pressure heliun1 gas,-discharge tube. a high-voha,ge po\ver upply wilh wire lead . a retort tand ,vith clarnps for holding the di charge tube. a diffraction grating. and two metre s1icks. TI1e group damps the ga..c.-discharge lube in to a vertical position and connecL<; it to the power . upply. A metre stick i. placed hori1.ontally, directly in front of the discharge tube . o 1hat the tube is lined up ,vith the 50.0 cm mark. The second rnetre tick i placed perpendicular to the first metre stick, directly in line with the center of the discharge tube. Finally, a diffraction graLing is placed I 00 cnl fro,n the low-pres ure heliu1n gas-discharge tube. TI,e diag,r;un below illu trace the set-up. Perspective Vic,\' of Student Apparatus _.,,.:;.--~kt~ ,11cl, rl-">cd p,rp<'nJt,;ul:a tn t-.adi N!v-f an.I 11..t 11po11 the !'-()0 ~m m.:irl When the power supply i switched on, an electric current pas e through the gas. and the tube en1it a pinkish-ycllo,\' lighl. U ing a diffraction grat ing etched with lines that are paced 4.35 x 10-6 n1 apart, the tuden1 observe a series of brightly coloured pcctral lines to lhc right of the location or the discharge tube. as shown belO\V. ~ ~\ W M The yellow spccLral line is ignific.intly brighter than the other line . The wavelength of the yc llo\.v spectral line for heliutn, ba cd on the students' observations. expre cd in scientific notation, i a.be x 10-d n-1. The value of a. b, c, and d are __ _ ___ . ___ .and __ _

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1. They are perpendicular to the direction of wave propagation.
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