Cadmium sulfide (CdS) is a semiconducting material with a pronounced sensitivity to light—as more light strikes it, its resistance goes down. In real devices, the resistance of a given device may vary over four orders of magnitude or more. An experiment was set up with a single light source in an otherwise dark room. The resistance of three different CdS photoresistors was measured when they were at various distances from the light source. The farther they were from the source, the dimmer tile illumination on the photoresistor.
Create a proper plot of the data. Use polyfit to determine a power model for each data set. For each model, add the trend line and the associated trend line equation to the graph. Use an appropriate location for the equations to clearly associate them with the correct trendline.
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Chapter 17 Solutions
Thinking Like an Engineer: An Active Learning Approach (4th Edition)
- Extrasolar Planets. In the not-too-distant future, it should be possible to detect the presence ofplanets moving around other stars by measuring the Doppler shift in the infrared light they emit. If a planetis going around its star at 50 km/h while emitting infrared light of frequency 3.330 x 1014 Hz, whatfrequency light will be received from this planet when it is moving directly away from us? (Note: Infraredlight is light having wavelengths longer than those of visible light.)arrow_forwardWeather radar provides information on the intensity as well as the total amount of precipitation. Table A shows the relationship between radar reflectivity values and rainfall rates. If radar measured a reflectivity value of 47 dBZ for 2½ hours at a particular location, how much rain has fallen there?arrow_forwardThe tungsten filament of an incandescent light bulb has a temperature of approximately 3000 K. The emissivity of tungsten is approximately 1/3, and you may assume that it is independent of wavelength. To increase the efficiency of an incandescent bulb, would you want to raise or lower the temperature? (Some incandescent bulbs do attain slightly higher efficiency by using a different temperature.)arrow_forward
- In a biprism experiment, the slit is illuminated by the light of wavelength 5890A.the distance between the slit and eye piece is 0.8m.the two virtual images of the slit are formed 0.2cm apart. Calculate the change in fringe width if the eye piece is displaced 10cm away from the slit.arrow_forwardPertaining to Lab 3 Q14, why is the peak net radiation approximately the same on the two dates seen in figures 3-5 and 3-6? The weather conditions must have been the same on those dates (i.e. clouds, pressure, temperature, etc.) The data for both days must have been taken on surfaces with the same albedo Botswana is right on the equator so it has very little variation throughout the year The latent heat, sensible, heat, and soil fluxes when averaged together are about the same on both days The sun angles are similar on both datesarrow_forwardEarth absorbs solar energy and radiates infrared energy. The intensity of the solar radiation incident on earth is J = 1350 Wm-2, also known as the solar constant. Assume earth’s surface (ground) temperature to be uniform at Ts, and that the ground and atmosphere are black (emissivity = 1) for infrared radiation. The radius of the earth is 6.378 x 106 m. The diagram shows the ground at the surface temperature Ts and the atmosphere, represented as a thin black layer, at temperature Ta . Suppose the atmosphere absorbs 100% of the infrared radiation emitted by the ground. Assume that the ground absorbs 47.5% of the incident solar energy, and that the atmosphere absorbs 17.5% of the incident solar energy (for a total of 65% absorbed by the planet). Calculate the "steady state” numerical values of the earth’s ground temperature Ts and the atmospheric temperature Ta taking into account the “greenhouse effect” of atmospheric infrared absorption and emission described above.arrow_forward
- A DVST, or Direct View Storage Tube, is a kind of optical storage medium.arrow_forwardDifferentiate the following thermal and optical properties: a. Thermal conductivity vs. thermal diffusivity b. Reflectance vs. transmittancearrow_forwardA thin film of oil, on the surface of glass , results in destructive interference. If the wavelength of the incident light (650 nm) , find the thickness of the film. (Nair =1; Nott = 1.45; Nglass = 1.52)arrow_forward
- A furnace with an aperture of 30 mm diameter and emissive power of 4x10^5 W/m^2 is used to calibrate a heat flux gage having a sensitive area of 2x10^-5 m^2At what distance, measured along a normal from the aperture, should the gage be positioned to receive irradiation of 1000 W/m^2 ? If the gage is tilted off normal by 20^o what will be its irradiation?arrow_forwardRadiant energy with an intensity of 800 W/m2 strikes a flat plate normally. The absorptivity is twice the transitivity and thrice the reflectivity. Determine the rate ofabsorption, transmission and reflection of energyarrow_forward
- Principles of Heat Transfer (Activate Learning wi...Mechanical EngineeringISBN:9781305387102Author:Kreith, Frank; Manglik, Raj M.Publisher:Cengage Learning