Double the slit width a and double the wavelength Q36.1 Light of wavelength passes through a single slit of width a. The diffraction pattern is observed on a screen that is very far from the slit. Which of the following will give the greatest increase in the angular width of the central diffraction maximum? Double the slit width a and double the wavelength Double the slit width a and halve the wavelength Halve the slit width a and double the wavelength Halve the slit width a and halve the wavelength All of the above will give the same increase. Answer: C

A36.1 Light of wavelength passes through a single slit of width a. The diffraction pattern is observed on a screen that is very far from the slit. Which of the following will give the greatest increase in the angular width of the central diffraction maximum? Double the slit width a and double the wavelength Double the slit width a and halve the wavelength Halve the slit width a and double the wavelength Halve the slit width a and halve the wavelength All of the above will give the same increase.

ultraviolet light of wavelength 50.0 nm Q36.2 Coherent electromagnetic radiation is sent through a slit of width 0.0100 mm. For which of the following wavelengths will there be no points in the diffraction pattern where the intensity is zero? ultraviolet light of wavelength 50.0 nm blue light of wavelength 500 nm. red light of wavelength 700 nm infrared light of wavelength 10.6 µm more than one of the above Answer: D

A36.2 Coherent electromagnetic radiation is sent through a slit of width 0.0100 mm. For which of the following wavelengths will there be no points in the diffraction pattern where the intensity is zero? ultraviolet light of wavelength 50.0 nm blue light of wavelength 500 nm. red light of wavelength 700 nm infrared light of wavelength 10.6 µm more than one of the above

Q36.3 In a single-slit diffraction experiment with waves of wavelength , there will be no intensity minima (that is, no dark fringes) if the slit width is small enough. What is the maximum slit width a for which this occurs? Answer: C The answer depends on the distance from the slit to the screen on which the diffraction pattern is viewed.

A36.3 In a single-slit diffraction experiment with waves of wavelength , there will be no intensity minima (that is, no dark fringes) if the slit width is small enough. What is the maximum slit width a for which this occurs? The answer depends on the distance from the slit to the screen on which the diffraction pattern is viewed.

Q36.4 In Young’s experiment, coherent light passing through two slits separated by a distance d produces a pattern of dark and bright areas on a distant screen. Complete the sentence: “If instead you use 10 slits, each the same distance d from its neighbor, the spacing between bright areas will _________ and the width of the bright areas will _________.” increase, stay the same decrease, stay the same stay the same, increase stay the same, decrease decrease, decrease Answer: D

A36.4 In Young’s experiment, coherent light passing through two slits separated by a distance d produces a pattern of dark and bright areas on a distant screen. Complete the sentence: “If instead you use 10 slits, each the same distance d from its neighbor, the spacing between bright areas will _________ and the width of the bright areas will _________.” increase, stay the same decrease, stay the same stay the same, increase stay the same, decrease decrease, decrease

Q36.5 Coherent light passes through six (6) slits separated by a distance d. The light produces a pattern of dark and bright areas on a distant screen. To produce a dark area at a certain position on the screen, what must be the path difference from adjacent slits to that position? Answer: E two of A, B, and C all three of A, B, and C

A36.5 Coherent light passes through six (6) slits separated by a distance d. The light produces a pattern of dark and bright areas on a distant screen. To produce a dark area at a certain position on the screen, what must be the path difference from adjacent slits to that position? two of A, B, and C all three of A, B, and C

interference of x rays scattered by different atoms in the crystal Q36.6 In an x-ray diffraction experiment using a crystal, a pattern of bright spots is formed on a screen. What causes this? interference of x rays scattered by different atoms in the crystal interference of x rays emitted by different atoms in the crystal interference of x rays scattered by different parts of an individual atom in the crystal interference of x rays emitted by different parts of an individual atom in the crystal none of the above Answer: A

A36.6 In an x-ray diffraction experiment using a crystal, a pattern of bright spots is formed on a screen. What causes this? interference of x rays scattered by different atoms in the crystal interference of x rays emitted by different atoms in the crystal interference of x rays scattered by different parts of an individual atom in the crystal interference of x rays emitted by different parts of an individual atom in the crystal none of the above

Use a lens of smaller diameter. Q36.7 You use a telescope lens to form an image of two closely spaced, distant stars. Which of the following will increase the resolving power? Use a filter so that only the blue light from the stars enters the lens. Use a filter so that only the red light from the stars enters the lens. Use a lens of smaller diameter. More than one of A, B, and C will work. None of A, B, or C will work. Answer: A

A36.7 You use a telescope lens to form an image of two closely spaced, distant stars. Which of the following will increase the resolving power? Use a filter so that only the blue light from the stars enters the lens. Use a filter so that only the red light from the stars enters the lens. Use a lens of smaller diameter. More than one of A, B, and C will work. None of A, B, or C will work.

wavelength 400 nm, slit width 0.10 mm Q-RT36.1 Rank the following single-slit diffraction experiments in order of the size of the angle from the center of the diffraction pattern to the first dark fringe, from largest angle to smallest angle. wavelength 400 nm, slit width 0.10 mm wavelength 400 nm, slit width 0.20 mm wavelength 600 nm, slit width 0.20 mm wavelength 600 nm, slit width 0.40 mm Answer: ACBD

A-RT36.1 Rank the following single-slit diffraction experiments in order of the size of the angle from the center of the diffraction pattern to the first dark fringe, from largest angle to smallest angle. wavelength 400 nm, slit width 0.10 mm wavelength 400 nm, slit width 0.20 mm wavelength 600 nm, slit width 0.20 mm wavelength 600 nm, slit width 0.40 mm Answer: ACBD

a radio telescope 100 m in diameter observing at a wavelength of 21 cm Q-RT36.2 You have been asked to compare four proposals for telescopes to be placed in orbit above the blurring effects of the earth’s atmosphere. Rank the proposed telescopes in order of their ability to resolve small details, from best to worst. a radio telescope 100 m in diameter observing at a wavelength of 21 cm an infrared telescope 2.0 m in diameter observing at a wavelength of 10 mm. an optical telescope 2.0 m in diameter observing at a wavelength of 500 nm an ultraviolet telescope 1.0 m in diameter observing at a wavelength of 100 nm Answer: DCBA

A-RT36.2 You have been asked to compare four proposals for telescopes to be placed in orbit above the blurring effects of the earth’s atmosphere. Rank the proposed telescopes in order of their ability to resolve small details, from best to worst. a radio telescope 100 m in diameter observing at a wavelength of 21 cm an infrared telescope 2.0 m in diameter observing at a wavelength of 10 mm. an optical telescope 2.0 m in diameter observing at a wavelength of 500 nm an ultraviolet telescope 1.0 m in diameter observing at a wavelength of 100 nm Answer: DCBA