The distance between a laser scanner and a building is 0.7 km. The distance can be calculated using equation below, where, ris the distance, c is the speed of light and Atis the time taken from the scanner and the object. r = 1 .c. At 2 Building size as in figure below. a0 m 10 m 10 m The laser scanning resolution is 1000 points in 200 cm. Consider c = 3.00x10" m/s.
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i. determine (estimate) the time taken for one point of this laser scanner to reach the object’s surface.
ii. calculate the number of points in surface Aof the object.
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- 1a) A green laser emits a beam of light of wavelength 532 nm in the air. The Wavenumber k is : Select one : a) 1.880x106 rad m-1 b) 1.067 x 107 rad m-1 c) 1.181 x 107 rad m-1 d) 6.701 x 107 rad m-1 1B) For the same 532 laser above, the angular frequency ω is : a) 5.094 x 1014 rad s-1 b) 3.543 x 1015rad s-1 c) 2.978 x 1015rad s-1 d) 6.401x 1015 rad s-1aste Home Cut E Copy Clipboard Format Painter Insert L 02 HE Design Layout Times New Roma 12 abc X₂ SE BIU BE EL E EL T References Mailings Review Α Α X²A - aly - A - BE L P 2615 words DX Accessibility. Unavailable O|| IN TELT 1 LED I TE TEL 1 Materials Hetalle Aluminum Copper Tron Silver Steel I 1 I Non-Metallic Cellulose Plexiglass Polyacetal Teflon E (polymethylmethacrylate) The specific heal capacity of rar-meta c materials makes them slower to heat up compared to metals. The thermal conductivity of metals makes them faster to heat up compared to non-metallic materials. The thermal conductivity of metals makes them slower to beat up compared to non-metallic materials. (polytetrafluoroethylene) View || .. I 19 Silicone (polydimethylsiloxane) faster. Help FEA T = - | Paragraph I What is the BEST explanation for why coolaware that is made of metallic materials typically will have handles made of non-metallic materials? 4 The specific heat capacity of non-metals are typically greater…Consider two waves of light, A and B. Wave A has a lower frequency than wave B. Then wave B must have: O A. longer wavelength B. higher speed O C. lower speed D. shorter wavelength O E. this can't be determined from the information given
- Question A1 A sodium laser emits a light beam of wavelength 589 nm in air, with a beam diameter of 3 mm and emitted power of 50 mW. Evaluate: i) the wavenumber ko, ii) the angular frequency w, and iii) the peak amplitude of the electric field E in the laser spot (you may assume beam divergence due to diffraction is negligible). Give the appropriate SI units in each case.2. A helium-neon laser of the type often found in physics labs has a beam power of 5.00 mW at a wavelength of 633 nm. The beam is focused by a lens to a circular spot whose effective diameter may be taken to be equal to 2.00 wavelengths. Calculate: a) the intensity of the focused beam b) the radiation pressure exerted on a tiny perfectly absorbing sphere whose diameter is that of the focal spot. c) the force exerted on this sphere. d) the magnitude of the acceleration imparted to it. Assume a sphere density of 5 x 10³ kg/m³.1. Assume that you are facing south direction at a time when the sun is just setting. The scattered light that comes to you is polarized such that electric field is oscillating in a plane which is (A) Horizontal with electric field along vertical direction. (B) Vertical with electric field along east west direction. (C) Vertical with electric field along vertical direction. (D) Horizontal with electric field along east
- A 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.Question A1 A HeNe laser emits a light beam of wavelength 633 nm in air, with a beam diameter of 3 mm and emitted power of 25 mW. Evaluate: i) the wavenumber ko, ii) the angular frequency w, and iii) the peak amplitude of the electric field E in the laser spot (you may assume beam divergence due to diffraction is negligible). Give the appropriate SI units in each case.1. Based on the material properties shown in the table, draw and explain electric field distribution assuming AC (60 Hz) voltage. (clearly show the difference in refraction angle) U Material 1 E (Vacuum Permittivity) Er (Relative Permittivity) Y (Conductivity) d (Thickness) Material 1 Material 2 8.85 x 10-12 [F/m] 1 10-15 [S/m] 3 10-18 [S/m] 5 [mm] 1 [mm] Dielectric Strength U (Voltage) 3 [kV/mm] 40 [kV/mm] 20 [kV] Material 2 2. Based on the material properties shown in the table, draw and explain electric field distribution assuming DC (0 Hz) voltage. (clearly show the difference in refraction angle) U Material 1 Material 2
- 19. A laser uniformly illuminates an area with green light that has an average intensity of 550 W/m2. What is the rms value of the electric field of this light? A) 322 N/C B) 405 N/C C) 455 N/C D) 643 N/C E) 891 N/C Ans: C1. Which law gives the relationship between refractive index of the dielectric? a) Law of reflection b) Law of refraction (Snell's Law) c) Millman's Law d) Huygen's Law 2. Light incident on fibers of angles_ the fiber. a) Less than b) Greater than c) Equal to d) Less than and equal to 3. The ratio of speed of light in air to the speed of light in another medium is called as a) Speed factor b) Dielectric constant c) Reflection index d) Refraction index the acceptance angle do not propagate into 4.When A is the optical wavelength in vacuum, k is given by k=20/A. What does k stand for in the above equation? a) Phase propagation constant b) Dielectric constant c) Boltzmann's constant d) Free-space constant 5.Optical fibers suffer radiation losses at bends or curves on their paths. a) True b) False 6.The lower energy level contains more atoms than upper level under the conditions of a) Isothermal packaging b) Population inversion c) Thermal equilibrium d) Pumping3. Electromagnetic waves from a radio station pass through an open window of a house. The square window has side length 0.75 m and the waves pass through perpendicular to the window's area. The electric field is measured at the window and found to be 0.02 V/m. In air, we can use the vacuum permeability = 4 x 10-7 H/m. (i) What is the magnitude of the Poynting vector, S, for the radio waves passing through the window? (ii) How much energy do the radio waves carry through the window during a 2-minute-long broadcast of BBC Radio 4's shipping forecast? [Hint: think of the units of S [units = (J/s)/m²] and Energy [units = J].