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Unformatted text preview: Student Name: w Student number: Multiple Choice Questions (2 points each; No partial credit will be given)
Clearly circle the letter of your choice. No point for questions with two or more choices marked. Q 1. The quantity of electrical potential, the volt, is dimensionally equivalent to:
/ (a) force/chalfge. (b) force >< chm/*ge.
lectric potential energy/charge. (d) electric ﬁeld/distance. (l 2 Which two resistors in the graph on the right are in series?
, R. and R2” (b) R2 andiRg (c) R3 and R4 (d) R1 and R4 What is the potential midway between the two charges? A 3. Two point charges, having 1.0 C and l.0 C, separated by l m.
’ (a) 8.99 x 10° N/C (b) 43.99 x 109 N/C (c) .4.50 x 109 N/C ero 4. An RLC circuit is connected to an AC source and is at resonance. The following has to be C/ true. (a)R=Xc (b)R=XL @xc=xL (d)R=XL~Xc 5. The force exerted on a current—carrying wire located in an external magnetic ﬁeld is directly
C proportional to which of the following?
(a) current (b) ﬁeld ©both current and ﬁeld (d) None of the above is valid. 6. The voltage induced in a coil positioned in a magnetic ﬁeld has to be larger if
C/ (a) the flux is larger (b) the ﬂux is positive
Q the rate of flux change is greater (d) the magnetic ﬁeld is stronger 7. A concave mirror with a focal length of 1.0 m faces to the left. The image‘of an object is 2.0
OK m to the right of the mirror. The object should be (a) 4.0 m in front of the mirror % 2.0 m in front of the mirror (c) 1.0 m in front of the mirror None of the above 8. A thin layer of liquid (110 = 1.40) of thickness t ﬂoats on water (nW = 1.33). When you point
C/ a red laser pointer (7» = 700 nm) on this la r, interference occurs when
(a) 2n,,t = ml (b) ZnWt = m]. @2110! = (m+1/2M (d) 2nwt = (m+1/2)]. & 9. An observer standing on the ground observes a fast moving ﬂag, and found its area to be 1
2 . . .
m . For a person traveling With the flag, the area Will be
> 1 m2 (b) < 1 m2 (c) = l m2 (d) not enough information to determine 10. An object is 10.0 m from a converging lens (focal length is 2.0 m). The image will be
(a) upright (b) same side of the lens compared to the object.
@ on the opposite side of the lens compared to the object \/ (d) larger than the object 11. A ray of light travels across a liquidtoglass interface. 1f the indices of refraction for the
C liquid and glass are, respectively, 1.75 and 1.52, what is the critical angle at this interface?
(a) 30.0" (b) 522° @6030 (d) Critical angle does not exist 12. President Bush will be in ofﬁce for 259 days, as of today (May 5, 2008). For an astronaut
ﬂ traveling at a speed of 0.8c relative to the Earth, this length of time will be > 259 days (b) < 259 days (c) = 259 days ((1) unlimited 13. Blue light will not eject electrons from a certain metal; however, which one of the following may possibly eject ectrons from that metal?
(a) infrared ultraviolet (c) red (d) green 14. The maximum number of electrons that ca stay in the n = 2 shell is
(a) 2 (b) 4 " (c) 6 @8 J Student Nam = 1 ‘ Student number: ﬂ
Problems You MUST show ALL your work and use correct units for numerical answers to receive full
credit. No credit for writing down equations only or answers only. 15. Three charges A, B, and C, having charges +4.0 X 10'4 C, ~2.0 x 10'4 C and +4.0 x 104 C,
respectively, are placed on the xaxis with a separation of 2.0 m between each adjacent pair. (a) Find the force (magnitude and direction) on charge A. (5 points) (b) Find the force (magnitude and direction) on charge B. (5 points) H7 F3 go 4W” ~>xlc"’ 4m” .2 @ (Ii/x? (YiIYC’Cifou 01L ’H‘; /FBA ’ a N14 i : . Off? 04 Ck .
( aio ‘ \ I! “(L76 VIE"
Mj X 0005 f0\ .H‘e nil/VD I 9‘ j +X~qxﬁ Student Namam StUdem number: 16. A beam of light is incident on Surface 1 of a rectangular block at an angle of incidence
6i= 80°. The index of refraction is m = 1.0 outside the block and n2 = 1.2 inside the block. (a) Find 6 as shown in the diagram. (5 points) (b) Find 92 as shown in the diagram. (5 points) (c) As the angle of incidence 9, is reduced from 80°, it will reach a value when total internal
reﬂection starts to occur at Surface 2. What is this value of 9.? (4 points) , aim Surfacel n=l cQﬂ (9 “t Sm 6" r n 2 same 9 : gm’K mime.) :SI‘HY 39.490“) z aoeyng I w.“ / l / Q2 :g;n*’( Vlzsi‘nGs : 934% L2 XSM 34:85" Student Name: '~ 17. A beam of light (7» = 600 nm) passes through two slits and forms a pattern on a screen 3.0 m away. The two slits are 56 at m0 (a) Determine the distance of_ “ V, x _ 7 _r ~rpgi~nimutaﬂgrn the_rnidpoint of the central bright fringe. (5 points)
(b) Determine the distance of the ﬁrst order maximum from the midpoint of the central bright
fringe. (5 points) '
(c) What is the width of the central bright fringe? (5 points)
(d) Find the difference between the distances from the 3rd order minimum on the screen to the
two slits. (4 points) /7 WM
Wlrl «. N  @an
b“‘1'” I ” 7.2mm“ : ¢€WM W" Student Name: Student numbe 18. The de Broglie wavelength of an electron is 2 nm. (a) What is the momentum of the electron? (5 points) (b) What is the kinetic energy of the electron? (5 points) (c) If a photon has the same energy, what is its wavelength? (4 points) h 7
(a) wwwtg; 5 WW“ 3'5 6 ——é : ﬂ v ,
>\ 2 x’o'cl m ’ @' K: ~_i72_ >257 { [I
2W‘le Egg?” >_j : é apj
z x (NNO'Z‘
@‘ E: Al 3 hi : ME Student Name: Student number” 19. In the spectrum of atomic hydrogen, there is a group of lines known as the Pfund series.
These lines are produced when electrons jump to the n = 5 level from higher levels. ) (a) List the possible values of quantum number I for the n = 5 states. (5 points) n: _ \/ H (b) Determine the longest emission wavelength in the Pfund series. (5 points) 3 (c) If an unknown atom has 552 electrons, list all the quantum numbers for the 532 electrons. (5 points) L1» 774 q Want/K M ntk mi) cf ...
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This note was uploaded on 09/13/2009 for the course PHY 102 taught by Professor Luo during the Spring '08 term at SUNY Buffalo.
 Spring '08
 LUO
 Physics

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