A soap bubble (n = 1.30) having a wall thickness of 127 nm is floating in air. (a) What is the wavelength of the visible light that is most strongly reflected? 6.6e2 nm (b) Explain how a bubble of different thickness could also strongly reflect light of this same wavelength. different thicknesses means that light reflects in different orders, so the m value will change to suit different thicknesses to have the same reflected light wave Score: 1 out of 1 Comment: (c) Find the two smallest film thicknesses larger than the one given that can produce strongly reflected light of this same wavelength. 643 Your response differs from the correct answer by more than 10%. Double check your calculations. nm (smaller thickness) nm (larger thickness)

A soap bubble (n = 1.30) having a wall thickness of 127 nm is floating in air. (a) What is the wavelength of the visible light that is most strongly reflected? 6.6e2 nm (b) Explain how a bubble of different thickness could also strongly reflect light of this same wavelength. different thicknesses means that light reflects in different orders, so the m value will change to suit different thicknesses to have the same reflected light wave Score: 1 out of 1 Comment: (c) Find the two smallest film thicknesses larger than the one given that can produce strongly reflected light of this same wavelength. 643 Your response differs from the correct answer by more than 10%. Double check your calculations. nm (smaller thickness) nm (larger thickness)

University Physics Volume 3

17th Edition

ISBN:9781938168185

Author:William Moebs, Jeff Sanny

Publisher:William Moebs, Jeff Sanny

Chapter3: Interference

Section: Chapter Questions

Problem 47P: To save money on making military aircraft invisible to radar, an inventor decides to coat them with...

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To save money on making military aircraft invisible to radar, an inventor decides to coat them with a nonreflective material having an index of refraction of 1.20, which is between that of air and the surface of the plane. This, he reasons, should be much cheaper than designing Stealth bombers. (a) What thickness should the coating be to inhibit the reflection of 4.00-cm wavelength radar? (b) What is unreasonable about this result? (c) Which assumptions are unreasonable or inconsistent?
A beam of 580-nm light passes through two closely spaced glass plates at close to normal incidence as shown in Figure P27.23. For what minimum nonzero value of the plate separation d is the transmitted light bright?
A horizontal laser beam of wavelength 632.8 nm has a circular cross section 2.00 nun in diameter. A rectangular aperture is to lie placed in the center of the beam so that when the light falls perpendicularly on a wall 4.50 m away, the central maximum fills a rectangle 110 mm wide and 6.00 mm high. The dimensions are measured between the minima bracketing the central maximum. Find the required (a) width and (b) height of the aperture. (c) Is the longer dimension of the central bright patch in the diffraction pattern horizontal or vertical? (d) Is the longer dimension of the aperture horizontal or vertical? (e) Explain the relationship between these two rectangles, using a diagram.
Figure 3.14 shows two 7.50-cm-long glass slides illuminated by pure 589-nm wavelength light incident perpendicularly. The top slide touches the bottom slide at one end and rests on some debris at the other end, forming a wedge of air. How thick is the debris, if the dark bands are 1.00 mm apart? Figure 3.14 (a) The rainbow-color bands are produced by thin-film interference in the air between the two glass slides. (b) Schematic of the paths taken by rays in the wedge of air between the slides. (c) If the air wedge is illuminated with monochromatic light, bright and dark bands are obtained rather than repeating rainbow colors.
The movable mirror of a Michelson interferometer is attached to one end of a thin metal rod of length 23.3 mm. The other end of the rod is anchored so it does not move. As the temperature of the rod changes from 15°C to 25 C , a change of 14 fringes is observed. The light source is a He Ne laser, =632.8 nm . What is the change in length of the metal bar, and what is its thermal expansion coefficient?
Two polarizing sheets P1 and P2 are placed together with their transmission axes oriented at an angle to each other. What is when only 25% of the maximum transmitted light intensity passes through them?
A glass sheet 1.10 μm thick is suspended in air. In reflected light, there are gaps in the visible spectrum at 573 nm and 645.00 nm. Calculate the minimum value of the index of refraction ?n of the glass sheet that produces this effect. ?=
Astronomers observe a 60.0 MHz radio source both directly and by reflection from the sea as shown in Figure P37.7. If the receiving dish is 20.0 m above sea level, what is the angle of the radio source above the horizon at the first maximum?
Plastic coatings are put in a car's glass window (n = 1.52) in order to keep the interior of cars cooler. What should be the index of refraction of the plastic film with minimum thickness of 107.5nm if you want the reflected light from both sides of the film to have no relative phase shift and to interfere destructively? The wavelength of the light in air is 600nm. I. 2.791 II. 1.395 III. 1.861IV. 1.321
Mourning doves have a small batch of iridescent feathers. The color isproduced by a 260-nm-thick layer of keratin (n = 1.56), with air on both sides that are found around the edge of the feather barbules. For what visible wavelength (or wavelengths) would this structure produce constructive interference? A) 686nm, 412nmB) 406nmC) 686nm, 541nm, 412nmD) 541nmE) 1622nm, 811nm, 270nm
The intensity L(x) of light x feet beneath the surface of the ocean satisfies the differential equation dL/dx=-kL. From experience, a diver knows that diving to 19 ft in a sea cuts the intensity in half. He cannot work without artifical light when the intensity falls below one-fifth of the surface value. About how deep can he expect to work without artifical light? round to the nearest tenth
Light with frequency 6.96E14 Hz travelling in vacuum enters a transparent material that has index of refraction equal to 1.72. What is the light wavelength in the material (in m)?