A satellite dish is shaped like a paraboloid of revolution. The signals that emanate from a satellite strike the surface of the dish and are reflected to a single point, where the receiver is located. If the dish is 14 feet across at its opening and 4 feet deep at its center, at what position should the receiver be placed?
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- Two antennas located at points A and B are broadcasting radio waves of frequency 104.0 MHz. The signals start in phase with each other. The two antennas are separated by a distance d = 8.7 m. An observer is located at point P on the x axis, a distance x = 110.0 m from antenna A. The points A, P, and B form a right triangle. What is the phase difference between the waves arriving at P from antennas A and B? Enter your answer in radiansWhat would be the refractive index of a compound at 20 C, if its refractive index was at 22.9 C and 1.4730 ?A laser used in LASIK eye surgery produces 55 pulses per second. The wavelength is 220.0 nm (in air), and each pulse lasts 10.0 ps. The average power emitted by the laser is 120.0 mW and the beam diameter is 0.800 mm. How long (in centimeters) is a single pulse of the laser in air?
- Two antennas located at points A and B are broadcasting radio waves of frequency 96.0 MHz, perfectly in phase with each other. The two antennas are separated by a distance d= 6.20 m. An observer, P, is located on the x axis, a distance x= 84.0 m from antenna A, so that APB forms a right triangle with PB as hypotenuse. What is the phase difference between the waves arriving at P from antennas A and B? A P X B 4.594x10-¹ rad Computer's answer now shown above. You are correct. Your receipt no. is 158-6031 > Previous Tries Now observer P walks along the x axis toward antenna A. What is P's distance from A when he first observes fully destructive interference between the two waves? 1.203 m As P gets closer A, the path length difference gets larger. What's the smallest path length difference that gives destructive interference? Submit Answer Tries 0/6 Submit Answer Incorrect. Tries 1/6 Previous Tries If observer P continues walking until he reaches antenna A, at how many places along the x…On a floor, there are several 1-4 mm elongated drops leading away from a body lying in a pool of blood. On the forward wall there is a zigzag pattern and on the walls to the right side, there is a linear pattern of droplets parallel to the floor at about the victim's height. No other marks are found on the other walls. Which bestA spherical source of light with a diameter Deource = 3.55 cm radiates light equally in all directions, with power P = 4.10 W. (a) Find the light intensity (in kW/m2) at the surface of the light source. |kW/m² (b) Find the light intensity (in mW/m2) r = 7.10 m away from the center of the light source. mW/m2 (c) At this 7.10 m distance, a lens is set up with its axis pointing toward the light source. The lens has a circular face with a diameter of Dlens = 16.0 cm and has a focal length of f = 34.0 cm. Find the diameter (in cm) of the light source's image. cm (d) Find the light intensity (in W/m2) at the image. |W/m2
- Two antennas located at points A and B are broadcasting radio waves of frequency 104.0 MHz. The signals start in phase with each other. The two antennas are separated by a distance d = 8.7 m. An observer is located at point P on the x axis, a distance x = 110.0 m from antenna A. The points A, P, and B form a right triangle. Now observer P walks along the x axis toward antenna A. What is P's distance from A when they first observe fully constructive interference between the two waves?Lunar astronauts placed a reflector on the Moon’s surface, from which a laser beam is periodically reflected. The distance to the Moon is calculated from the round-trip time. What percent error is this, given the average distance to the Moon is 3.84 × 108 m?A laser with 7.6 watts of power has a diameter of 13 cm. It's directed at the surface of a silver lined reflecting satellite in space with a mass of 75 kg. If the diameter of the satellite is greater than 20 cm what's the acceleration of the satellite and how long will it take to reach a speed of 15 km/s?