Under favorable conditions, the human eye can detect light waves with intensities as low as 2.50 x 10-12 W/m². At this intensity, what is the average power incident on a pupil of diameter 8.10 mm? W If this light is produced by an isotropic source 11.6 m away, what is the average power emitted by the source
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- An FM station broadcasts classical music at 96.0 MHz (megahertz, or 106 Hz). Find the wavelength (in m, nm, and ) of these radio waves.e A typical laser used in introductory physics laboratories produces a continuous beam of light about 1.0 mmin diameter. The average power of such a laser is 0.75 mW. Whatare (a) the average intensity, (b) the peak intensity, and (c) theaverage energy density of this beam? (d) If the beam is reflectedfrom a mirror, what is the maximum force the laser beam canexert on it? (e) Describe the orientation of the laser beam relativeto the mirror for the case of maximum force(a) What is the intensity in W/m² of a laser beam used to burn away cancerous tissue that, when 90.0% absorbed, puts 500 J of energy into a circular spot 2.3 mm in diameter in 3 s? 2 W/m (b) Reflect on how this intensity compares to the average intensity of sunlight (about 1W/m²) and the implications that would have if the laser beam entered your eye. Note how your answer depends on the time duration of the exposure. The intensity of a laser is abc lasers can be very damaging 100 1,000 10E7 - 10E8 10E12 times that of the sun, so clearly
- 10. An observer r= 4.00 km from a radio transmitter detects a signal from that transmitter with an intensity of I = 5.00µW / m² at the observer. a Whatis the amplitude of the electric field of the signal at the observer, E,? b. What is the amplitude of the magnetic field of the signal at the observer, B? If the transmitter emits radio waves isotropically, what is the average transmitter power, C. P?Consider a room heater that uses a concave mirror to reflect infrared radiation from hot coils. The mirror has a radius of curvature of 49.0 cm and produces an image of the coils 3.10 m away from the mirror. Calculate the intensity of IR radiation in W/m2 projected by the concave mirror on a person 3.10 m away. Assume that the heating element radiates 1,350 W and has an area of 130 cm2, and that half of the radiated power is reflected and focused by the mirror.need help
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- Satellite TV is broadcast from satellites that orbit the earth. Their antennas broadcast a 15 kW microwave signal that covers most of North America, an area of about 2.5 × 107 km2. What is the total power that strikes a 46-cm-diameter ground-based dish antenna?A microwave source produces pulses of 21.0 GHz radiation, with each pulse lasting 1.00 ns. A parabolic reflector with a face area of radius R = 8.50 cm is used to focus the microwaves into a parallel beam of radiation, as shown in the figure below. The average power during each pulse is 25.0 kW. (a) What is the wavelength of these microwaves? cm (b) What is the total energy contained in each pulse? μJ (c) Compute the average energy density inside each pulse. mJ/m³ 3 (d) Determine the amplitude of the electric field and magnetic field in these microwaves. Emax kv/m μT B. max (e) Compute the force exerted on the surface during the 1.00 ns duration of each pulse. Assume this pulsed beam strikes an absorbing surface. UNA typical laser used in introductory physics laboratories produces a continuous beam of light about 1.90 mm in diameter. The average power of such a laser is 0.930 mW. What is the peak intensity? O 434 W/m² O 775 W/m² O 558 W/m² O 868 W/m² O 656 W/m²