7. The pupil of an eagle's eye has a diameter of 6.0 mm. Two field mice are separated by 0.010 m. From a distance of 201 m, the eagle sees them as one unresolved object and dives toward them at a speed of 24 m/s. Assume that the eagle's eye detects light that has a wavelength of 550 nm in vacuum. How much time passes until the eagle sees the mice as separate objects?
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- A beam of unpolarized light carries 2000 W/m² down onto an air-plastic interface. It is found that the light reflected at the interface 300 W/m² is s-polarized and 200 W/m² is p-polarized. Determine the net transmittance across the interface. nswers: T= 75%10² 106 Increasing frequency, f (Hz): 104 106 1 Radio waves (low f, longa) AM 104 10² Decreasing wavelength,λ (m) 108 FM TV 1 1010 Microwave Radar 10-2 10¹2 700 nm 10-4 1014 Infrared 10-6 600 nm 1016 Ultra- violet 10-8 Visible light 1018 X rays 10-10 500 nm 1020 1022 Gamma (y) waves (high f, short 2) 10-12 10-14 400 nm 102410. A beam of light polarized along the y axis and moving along the +z axis passes through two polarizing sheets with axes of polarization oriented 30° and 70° measured clockwise from the positive direction of the y axis. The final intensity of the beam is found to be 61 W/m². What is the initial beam intensity? (1) 280 W/m² (2) 700 W/m² (3) 200 W/m² 11. Light of wavelength 520 nm is incident perpendicularly on a diffraction grating having 200 lines/mm. What is the highest order for which a sharp maximum occurs? (1) 9 (2) 11 (1) 0.5 V 12. Three long straight wires run perpendicular to the plane of the page and carry currents in the directions indicated in the figure. Wire 1 passes the y axis of the plane at y = 1.5 m, wire 2 goes through the origin, and wire 3 passes the x axis at x = 1.5 m. If the magnitudes of the currents in wires 1, 2, and 3 are i1 = 1.0 A, 12 = 2.0 A and i3 = 3.0 A, respectively, what is the magnitude of the vertical component of the force per unit length on wire…
- 2. Between the transmitter and the receiver working at 2.4 GHz, there is an object like a cube with volume 125cm³. Will this object cause reflection or scattering?An argon-ion laser produces a cylindrical beam of light whose average power is 0.936 W. How much energy is contained in a 2.33-m length of the beam? Number i Units 12 +10² 106 Increasing frequency, f (Hz): 104 106 1 Radio waves (low f, longa) AM 104 10² Decreasing wavelength,λ (m) 108 FM TV 1 1010 Microwave Radar 10-2 10¹2 700 nm 10-4 1014 Infrared 10-6 600 nm 1016 Ultra- violet 10-8 Visible light 1018 X rays 10-10 500 nm 1020 1022 Gamma (y) waves (high f, short 2) 10-12 10-14 400 nm 1024
- 2. The electric fields from three coherent sources are described by Ej=E0 sin wt, E2 =Eo sin(wi+P), and E3- Eo sin(wi+2$). Let the resultant field be represented by Ep= ER sin(wt+ ¤). Use phasors to find ER and when (a) 0=0°, (b) ¤=60.0°, (c) Ø=120°, and (d) = 180°1. A helium-neon laser, radiating at 632.8 nm, has a power output of 3.0 mW. The beam diverges at angle 0.17 mrad as in fig 1. (a) What is the intensity of the beam 40m from the laser? (b) What is the power of a point source providing that intensity at that distance? Laser Figure 1: Helium neon laserA CD or DVD uses a laser to read information from small depressions on a disk. Which of the following would allow you to read the largest amount of information from the disk? an infrared laser. an ultraviolet laser. a laser using red light. O a laser using green light.
- 12. Three polarizing disks have planes that are parallel and centered on a common axis. The direction of the transmission axis (dashed line) in each case is shown relative to the common vertical direction. An unpolarized beam of light is incident from the left on the first disk with intensity S, 800 W/m². Calculate the transmitted intensity if 0₁ 03 = 42.0°. = = 26.0°, 02 to the 195 9 W/m² 100 01100 0110001001100 01100 011 0₂ Fl = Q 6 ccm 6 ccici16 c 76 cci16 cci16 cei16 *16 cc 16 ceil6 cci16 ceiv 35.0°, and ci16 ceil6 cci16 cci16 il6 cci16 cci2. A 50-cm tall fish tank is 3/4 full with oil and exposed to the air. A laser beam with a wavelength of 6333 Å (633.3 nm) is incident on the surface of the oil at an angle of 20° above the surface. (a) How far does the laser beam travel in the oil? (b) How long after striking the surface of the oil does it take for the laser beam to reach the bottom of the tank? Note- the index of refraction for the oil is 1.48. [Answer: (a) d = 0.49 m; (b) At = 2.4 × 10-9 s]Unpolarized light passes through two ideal polarizers. The axis of the first is vertical, and the axis of the second is at 70° to the vertical. What fraction of the incident light is transmitted through both polarizers? 0.342 0.171 0.0585 0.117