Practice Problems 3

# Practice Problems 3 - Shaleen Shukla- Physics 12 – Spring...

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Unformatted text preview: Shaleen Shukla- Physics 12 – Spring 2009 1 Practice Problems #3 1 pt In Young’s two-slit experiment, the first dark fringe above the central bright fringe occurs at an angle of 0.267 ◦ . What is the ratio of the slit separation, d , to the wavelength of the light, λ ? 1 . A 5 . 73 × 10 1 B 6 . 70 × 10 1 C 7 . 84 × 10 1 D 9 . 17 × 10 1 E 1 . 07 × 10 2 1 pt Laser light with a wavelength λ = 626 nm illuminates a pair of slits at normal incidence. What slit separation will produce first-order maxima at angles of +/- 20.3 ◦ from the incident direction? (in m ) 2 . A 1 . 32 × 10- 6 B 1 . 54 × 10- 6 C 1 . 80 × 10- 6 D 2 . 11 × 10- 6 E 2 . 47 × 10- 6 1 pt A thin film of soap with n = 1.36 hanging in the air reflects dominantly red light with λ = 699 nm. What is the minimum thickness of the film? (in nm ) 3 . A 7 . 881 × 10 1 B 8 . 905 × 10 1 C 1 . 006 × 10 2 D 1 . 137 × 10 2 E 1 . 285 × 10 2 1 pt Now this film is on a sheet of glass, with n = 1.45. What is the wavelength of the light in air that will now be predominantly reflected? (in nm ) 4 . A 2 . 422 × 10 2 B 2 . 737 × 10 2 C 3 . 093 × 10 2 D 3 . 495 × 10 2 E 3 . 949 × 10 2 Due never 1 pt The first-order line of 595 nm light falling on a diffrac- tion grating is observed at a 15.4 ◦ angle. How far apart are the slits? (in m ) 5 . A 1 . 43 × 10- 6 B 1 . 79 × 10- 6 C 2 . 24 × 10- 6 D 2 . 80 × 10- 6 E 3 . 50 × 10- 6 1 pt At what angle will the third order be observed? (in deg ) 6 . A 4 . 51 × 10 1 B 5 . 28 × 10 1 C 6 . 18 × 10 1 D 7 . 23 × 10 1 E 8 . 46 × 10 1 1 pt Due never A screen is placed 49.9 cm from a single slit, which is illuminated with light of wavelength 685 nm . If the distance between the first and second minima in the diffraction pattern is 3.00 mm , what is the width of the slit? (in m ) 7 . A 3 . 74 × 10- 5 B 5 . 42 × 10- 5 C 7 . 86 × 10- 5 D 1 . 14 × 10- 4 E 1 . 65 × 10- 4 1 pt A neon sign in front of a cafe flashes on and off once every 5.50 s, as measured by the head cook. How much time elapses between flashes of the sign as measured by an astronaut in a spaceship moving toward Earth at a speed of 0.806 c? (in s ) 8 . A 9.29 B 1 . 05 × 10 1 C 1 . 19 × 10 1 D 1 . 34 × 10 1 E 1 . 52 × 10 1 1 pt Suppose the speed of light in a vacuum were only 25.5 mi/hr. Calculate the length of a bicycle being ridden at a speed of 19.6 mi/hr as measured by an observer sitting on a park bench, given that its proper length is 1.88 m. (in m ) 9 . A 9 . 04 × 10- 1 B 1.20 C 1.60 D 2.13 E 2.83 1 pt An asteroid with a mass of 6.92E+11 kg is observed to have a relativistic momentum of magnitude 7.85E+20 kg*m/s. What is the speed of the asteroid relative to the observer?...
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## This note was uploaded on 11/27/2011 for the course PHYS 105 taught by Professor Walker during the Fall '08 term at UNC.

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Practice Problems 3 - Shaleen Shukla- Physics 12 – Spring...

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