ON-LINE PHYSICS 122 EXAM #2 (all online sections)

Transcription

1 ON-LINE PHYSIS EXAM # (all nline setins) ) Bubble in the ID number setin f the santrn. ) This Exam is hurs lng - 34 multiple-hie questins. hse the ne BEST answer fr eah questin. Yu are nt penalized fr guessing. Wath yur time. (Answer all questins.) 3) YOU ARE RESPONSIBLE FOR WATHING THE TIME AND HANDING IN THE EXAM WITHIN THE TIME LIMIT. 4) Yu may use nly a penil and alulatr. (Frmula sheet is prvided.) 5) Use the test as srath paper (r the paper prvided by the testing enter). Hand EVERYTHING bak in r yu will reeive a 0 n the exam. 6) Sring: all 5 answer hie questins are 6 pts. eah, all 3 answer hie questins are 3 pts. eah, all answer hie questins are pts. eah. Ttal pssible pints = 80 pts. 7) This is test frm _A_. Be sure t FILL THIS IN n yur santrn frm. All frms are equivalent tests (nly numbers have been hanged.) 8) Als, write yur name and sign the santrn frm. Gd Luk! \ Name: Parkland ID Number: Date: Time In: Time Out:

2 DID YOU BUBBLE IN AN ID NUMBER AND TEST FORM ON THE SANTRON? (see frnt page fr instrutins)

3 Questins #-3 refer t the situatin belw: nsider the fllwing three senaris fr this nave mirrr with enter f urvature and fal pint F. F F F Senari A An bjet (represented by the arrw) is plaed between the fal pint and the mirrr Senari B An bjet is plaed between the fal pint and the enter f urvature Senari An bjet is plaed further than the enter f urvature frm the mirrr ) Fr whih f the three senaris will the image frmed be upright and virtual? a) A and B b) B and ) nly d) nly A e) A, B and ) Fr Senari : Given that the fal length f the mirrr is 5.0 m and that the bjet is plaed 35.0 m frm the mirrr, hw far frm the mirrr with the image be frmed? a) 0.5 m b) 5.0 m ) 6.5 m d) 30.0 m e) 35.0 m 3) Fr Senari B: Given that the fal length f the mirrr is 5.0 m, the bjet is plaed 0.0 m frm the mirrr, and the bjet (i.e. the arrw) is 4.5 m tall, hw tall wuld the image be? a).3 m b).5 m ) 4.5 m d) 3.5 m e) there is n image frmed

4 y x n =.45 n =? 4) mpute the index f refratin n fr this beam f light traveling thrugh an ptial bundary as shwn abve. (Nte: bth angles are measured with respet t the nrmal, the dtted line in the figure.) a) 0.56 b).8 ).38 d).79 e).97 5) The diagram belw shws a beam f light that travels in a piee f glass with index f refratin.60. The light then reflets ff the aluminum n ne side f the glass and air n the ther side f the glass. What is the smallest angle in rder t ensure that the beam des nt reenter the air at the upper surfae f the glass, but instead ttally internally reflets bak int the glass? a) 0 b) 38.7 ) 43.6 d) 46.4 e) 5.8 air glass aluminum n =.00 n =.60 6) At what speed des the beam f light travel while it is inside the glass? a).88 x 0 8 m/s b) 3.00 x 0 8 m/s ) 4.80 x 0 8 m/s

5 Questins #7-8 refer t the diagram belw representing a nverging lens with a fal length f 35 m. F F 7) An bjet (represented by the arrw) is plaed 60 m t the left f the lens. At what distane t the right f the lens wuld yu plae a sreen in rder t see the image in fus? a) 35 m b) 60 m ) 70 m d) 84 m e) 0 m 8) The image frmed n the sreen will be: a) Upright and Real b) Inverted and Real ) Upright and Virtual d) Inverted and Virtual e) Nne f the abve 9) The diagram belw shws tw nverging lenses arranged alng a mmn axis. The lens n the left (Lens ) has a fal length f 6 m and the lens n the right (Lens ) has a fal length f m. An bjet (represented by an arrw) is plaed 5 m t the left f Lens. The latin f the image frmed by this mbinatin f lenses is frmed a) at the latin f Lens b) 0 m t the left f Lens ) 0 m t the right f Lens d).5 m t the left f Lens e).5 m t the right f Lens Lens Lens 5 m 0 m

6 Refer t the diagram belw fr Questins #0-. The diagram represents a duble slit interferene pattern in whih the slits are separated by a distane d = 0.5 mm, and the sreen is lated at a distane f L = 4 m frm the slits. 0) If light f wavelength 500 nm (500x0-9 m) is inident n these slits, what is the distane between the entral maximum and the first rder bright fringe? a).4 mm b) 5.6 mm ) 5.9 mm d) 6.7 mm e) 8.0 mm d L ) Fr the same 500 nm inident beam, at what angle frm the entral axis will the 5 th rder bright fringe be frmed? a) 0.7 b) 0.37 ) 0.57 d) 0.77 e) 0.97 ) If the inident light is hanged frm 500 nm t 400 nm, the distane between the entral maximum and the first rder bright fringe a) inreases b) dereases ) remains the same

7 3) When light f wavelength 700 nm passes thrugh a diffratin grating nt a sreen, the angle between the enter fringe and the first rder bright fringe is What is the spaing between the slits n the diffratin grating? (nte: m = x0-6 m) a) 0.7 m b) 0.67 m ).7 m d).67 m e).7 m Questins #4-5 refer t the diagram belw representing a thin layer f mineral il flating n water. Light is inident n the mineral il after passing thrugh the air diretly abve. air mineral il water n =.00 n =.46 n =.33 4) What is the lngest wavelength f light that will experiene nstrutive interferene when viewed frm diretly abve if the layer f mineral il is 0 nm thik? a) 40 nm b) 350 nm ) 480 nm d) 640 nm e) 700 nm 5) If the layer f mineral il strethes ut and bemes thinner as it des s, the abve answer: a) inreases b) dereases ) remains the same

8 Questins #6-7 refer t the graph belw whih represents the single slit interferene pattern when light f 700 nm wavelength falls n a sreen.0 m beynd the slit. 6) What is the width f the slit? a) 0.4 mm b) 0.8 mm ) 0.4 mm d) 0.56 mm e) 0.70 mm 7) If the wavelength f the light inident n the single slit is redued t 650 nm, the width f the entral maximum wuld be: a) less than m b) greater than m ) equal t m 8) A beam f light reflets ff tw plane mirrrs arranged perpendiular t ne anther as shwn belw. alulate the angle marked. (diagram nt neessarily drawn t sale) a) 30 b) 45 ) 60 30

9 Questins #9- invlve a phteletri experiment, the maximum wavelength that will ejet eletins is 80 nm. When the eletrns are ejeted they travel in a iruit with a vltage sure that an be adjusted. 9) What is the wrk funtin f the metal? a).43 ev b).43 ev ) 3.43 ev d) 4.43 ev e) 5.43 ev 0) Nw light with a frequeny f.34 x 0 5 Hz is used. What is the kineti energy f the ejeted eletrns? a). ev b) 3.35 ev ) 4.68 ev d) 5.4 ev e) 6.3 ev ) If the intensity f the light sure is inreased the energy f the ejeted eletrns will? a) inrease b) derease ) remain the same ) If a new light sure is used that ejets eletrns with an energy f.57 ev, what will the de Brglie wavelength f the ejeted eletins be? a) 0.36 nm b) 0.76 nm ).46 nm d).06 nm e).96 nm

10 Questins #3-5 deal with a phtn sattering f an eletrn by a mptn press. 3) What is the maximum hange in wavelength fr a phtn during a mptn sattering event (whih urs when the phtn rebunds diretly bak at = 80)? (nte: pm = x0 - m) a). pm b).43 pm ) 3.64 pm d) 4.85 pm e) 7.8 pm 4) In suh an event, what is the resultant kineti energy f the eletrn? Assume that befre the sattering event the eletrn had zer velity and the inming phtn had a wavelength f 00 pm. (Hint: energy is nserved in mptn sattering.) a) 5 ev b) 79 ev ) 574 ev d) 69 ev e) 834 ev 5) If the sattering angle frm abve was hanged t 90, the velity f the eletrn after the sattering event wuld? a) inrease b) derease ) remain the same

11 Questins #6-7 invlve an eletrn in a hydrgen atm is in the 3s rbital. 6) What are the pssibilities fr the quantum number m l? a) 0 b) 0 r ) -, 0, r d) 0,,, r 3 e) -3, -, -, 0,, r 3 7) What energy phtn will be emitted by the atm if this eletrn makes a transitin t the p rbital? (Nte: this rrespnds t a transitin frm n=3 t n=.) a) 0.66 ev b). ev ).89 ev d).55 ev e) 6.8 ev 8) If instead f hydrgen this were a Magnesium atm whih has eletrns hw many eletrns an fit int the 3s subshell? a) b) 4 ) 6 d) 0 e) 9) A physiist nw wants t fre an eletrn in the 3s subshell f Magnesium t transitin t the n= state whih already has eletrns. Will the physiist sueed? a) Yes, due t the Heisenberg Unertainty Priniple. b) Yes, due t the nd pstulate f Speial Relativity. ) N, due t the Pauli Exlusin Priniple.

12 Questins #30-3 invlve the nuleus. 30) Hw many prtns and neutrns des this nuleus have? a) 6 prtns, 8 neutrns b) 8 prtns, 6 neutrns ) 6 prtns, 4 neutrns d) 8 prtns, 4 neutrns e) 4 prtns, 6 neutrns 3) arbn deays int nitrgen via what type f deay? a) α (alpha) b) β (beta) ) (lambda) d) δ (delta) e) (theta) 3) The half-life f arbn-4 is 5700 years. A piee f rgani matter is disvered in whih nly.5% f the initial arbn-4 atms remain. Hw ld is the sample? a) 5,700 years b),400 years ) 7,00 years d) 34,00 years 3) 45,600 years Questins #33-34 invlve a spaeship that flies away frm earth at ) Peple n earth measure the length f the spaeship t be 90 m when it is mving at If it lands n the earth hw lng will the landing pad need t be fr the spaeship t fit? a) 74 m b) 00 m ) 90 m d) 36 m e) 49 m 34) If the spaeship (while mving away frm the earth at 0.85) launhes a sut ship bakwards twards earth with a velity f 0.45 with respet t the spaeship hw fast d bservers n earth measure the speed f the sut ship? a) 0.40 b) 0.45 ) 0.65 d).00 e).0

13 F ma kqq U r p Online Physis Frmulas A d kq q F r U V q Q V F E q kq V r U QV s R s R R kq E r V E d Q I t R L R R V IR P IV A Q Q e t R I Q Q e F qvbsin F ILBsin B r mv B ni r B qb BAs emf vbl emf N t Z R P V rms I rms B X L X I I s s LI U s s V p N p R p R t V N V I Z rms rms X X L fl f f f L X L X tan R U E B E B 9 k Nm / / m N q 9 e / 8 30 m/ s Tm A

14 d d Online Physis Frmulas i f n n sin n sin v m h d i i f R i r h d sin n n tan P d sin m d sin m W sin m f min. t m ' t m' ' D n h h hf KEmax W ' s p E hf m B n n E p m 4 E n 3.6eV n py h 4 Et h 4 t t v v L L p mv v E m v v AB va v v v B A B 8 30 m/ s 34 h J s m 3 e 9.0 kg 7 m p.67 0 kg