Direction. Select the BEST answer. Write the corresponding CAPITAL LETTER of your choice in a separate sheet of paper. Write E if you find no correct answer. Consider the figure in answering 1 - 4 B F K 1. Wavelength is the horizontal distance in the wave train. Determine the wavelength. A. A & D B. B & D C. D & G D. D & H 2. Which points are the crest? A. B & F B. G & L C. D & H D. C & G 3. Which points are the trough? A. B & F B. C & G C. D & H D. G & L 4. Which points are in-phase? A. A & C B. A & E C. B & H D. C & E 5. How many wavelengths are there from point A to point L? A. 17 B. 1 1/2 A C. 21 D. 21/2 A 6. What principle is responsible for light spreading as it passes through a narrow slit? A. refraction B. polarization C. diffraction D. interference 7. What principle is responsible for alternating light and dark bands when light passes through two or more narrow slits? A. refraction B. polarization C. diffraction D. interference 8. Which of the following is an evidence that light is a form of wave? A. Light can meet each other and produce fringes or bright and dark regions ona screen behind. B. Light travels as tiny particles from a luminous object to the eye. C. Light is a tiny particle called corpuscle sent out by luminous bodies D. Light is a threadlike streamers emitted by the eye 159. Pure constructive interference occurs between two waves. when they\"' have the SHINE . A. amplitude and are in phase B. frequency and are out of phase C. frequency and are in phase D. amplitude and are out of phase In. What kind[s} of interference can occur between two identical waves moving in opposite directions? A. Constructive interference onlyr B. Destructive interference only [2. Both constructive and destructive interference D. Neither constructive nor destructive interference 11.Une beam of coherent light travels path P1 in arriving at point Q and another coherent beam travels path P2 in arriving at the same point. If these two beams are to interfere destnjctively, the path difference P] - P2 must be equal to A. an odd number of half-wavelengths. B. zero. C. a whole number of wavelengths. D. a whole number of halfvwavelengths 12.Two beams of coherent light travel different paths arriving at point P. If the maximum constructive interference is to occur at point P. the two beams must A. arrive 130\" out of phase. B. arrive 900 out of phase. (1 travel paths that differ by a whole number ofwavelengths. D. travel paths that differ by an odd number of half-wavelengths. 13.Light of wavelength 530 nm is incident on a slit of width 0.300 mm. An observing screen is placed 2.00m from the slit. Find the position of the first order dark fringe from the center of the screen. A 0.26 mm B. 1.9 mm C. 3.9 mm D. 7.? mm 111-. If 31 and a; are the amplitudes oftwo sources in Young's double slit experiment. then the maximum intensity of interference fringe is A. (a, + a;] E. 21's, + a;} C. [at + a2}2 D. [a1 - an]2 15. Effect of diffraction is greatest if waves pass through a gap with width equal to A. frequency B. wavelength C. amplitude D. wavefront Gauge MULTIPLE CHOICE. Read and analyze each question then select the BEST answer. IWrite the corresponding CAPITAL LETTER of your choice in a separate sheet of paper. If you consider a blinking light source that is receding an observer, what happens to its speed? A. Increases B. Decreases C. Remains the same D. Needs more information If you consider a blinking light source that is receding an observer, what happens to its frequency? A. Increases B. Decreases C. Remains the same D. Needs more information If you consider a blinking light source that is receding from an observer. what happens to its wavelength? A. Increases B. Remains the same C. Decreases D. Needs more information Which of the following event is m based on the special theory of relativity? A. Clocks that are moving run slower than when they are at rest. B. Clocks that are moving run faster than when they are at rest. C. Clocks run at the same rate regardless of whether they are moving or not. D. Clock run at rates that depend on an observer's inertial frame of reference. 13 5. Which of the following is TRUE about the speed of light? A. The speed of light is slower in a moving frame of reference. B. The speed of light is constant in an inertial frame of reference. C. The speed of light has the same value for observers in all reference frames. D. The speed of light has a value that depends on the observer's frame of reference. 6. What situation does relativistic formula for length contraction, time dilation and relativistic mass are valid? A. Only for speeds less than 0.10c B. Only for speeds greater than 0.10c C. Only for speeds very close to c D. For all speeds 7. Suppose you are in rocket ship going faster and faster. As your speed increases and your velocity gets closer to the speed of light, which of the following can be observe in your frame of reference? A. Mass increases B. Length shortens C. Clock slows down D. All of the above 8. The spaceship which is measured to be 50 m long by the captain. When the spaceship past a space dock at 0.5c, space dock personnel measure the rocket ship to be 43.3 m long. What is the proper length? A. 13.3 m B. 43.3 m C. 50.0 m D. 93.3 m 9. As the spaceship in Number 8 passes by the space dock, the ship's captain flashes a flashlight at 1.00 s interval as measured by space-dock personnel. How often does the flashlight flash relative to the captain? A. Every 0.87 s B. Every 1.15 s C. Every 1.00 s D. cannot determine 10. What does this expression represent: - A. Time dilation C. Relativistic factor B. Length contraction D. Relativistic energy II. TRUE OR FALSE. Read each statement below carefully. Write T if the statement is correct and F if not correct. Write your answer in a separate sheet of paper. 1. An object's length will be the same when it travels close to the speed of light. 2. The time will noticeably slow down when travelling at speed close to c. 3. Length and height are being changed as a consequence of Special Theory of Relativity. 4. Relativistic mass increases with the speed of an object relative to the reference frame. 5. Relativistic effects are significant only at high speeds or close to the speed of light. 14