College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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- For CCI4, the viscosity at 0 ° C is 1.33 x 10-3 kg m-1 s-1 and the activation energy is 10.9 kJ mol-1? Estimate the viscosity at 30 ° C.arrow_forwardI Review I Constants Part A It is increasingly common to check a person for a fever by measuring the temperature of the forehead with a noncontact infrared thermometer. A person with a normal body temperature has a forehead temperature of about 33°C. This increases to 36°C or higher for a person who has a fever. In principle, an infrared thermometer could measure either the peak wavelength or the radiated power of the thermal emission because both depend on the object's temperature. What is the percent decrease in the peak wavelength if a person's forehead temperature increases from 33° C to 36° C? Express your answer as a percentage. ? % Submit Request Answer Part B The total radiated power depends on an object's surface area, but the radiated power per unit area depends on only the object's temperature and its emissivity. The emissivity of human skin is 0.97. What is the percent increase in the radiated power per unit area if a person's forehead temperature increases from 33°C to 36°…arrow_forwardAssume the intensity of solar radiation incident on the cloud tops of the Earth is 1 677 W/m². (a) Taking the average Earth-Sun separation to be 1.496 x 10¹1 m, calculate the total power radiated by the Sun. 4.905E26 x Your response is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation. Carry out all intermediate results to at least four-digit accuracy to minimize roundoff error. W (b) Determine the maximum value of the electric field in the sunlight at the Earth's location. kv/m (c) Determine the maximum value of the magnetic field in the sunlight at the Earth's location. μTarrow_forward
- The conversion between electron-volts and joules is 1 eV=1.60x10^-19 J . The work function for silver is 7.43 x 10^-19 . What is the work function for silver expressed in electron-volts?arrow_forwardThe energy-level diagram for the atomic emission spectra of an unknown gas is presented in the diagram below. n = 4 4.0 ev n = 3 1.8 eV n = 2 1.5 ev n=1 O ev Part A Initially, electrons are only in the ground state (n=1). A beam of red light hits the gas. This beam is a continuous spectrum of red light (from 620 nm to 750 nm) How many absorption line/s will there be in the spectra? 1 Correct Part B Initially, electrons are only in the ground state (n=1). A beam of red light hits the gas. This beam is a continuous spectrum of red light (from 620 nm to 750 nm) Calculate the wavelength of the absorption line ? da = nm Submit Previous Answers Request Answer X Incorrect; Try Again; 4 attempts remainingarrow_forwardB4. A bone sample has a density p = 1.2x10³ kg/m³, a molar mass m = 217 g/mol and an interaction cross section per atom o = 6.0x10-22 cm². Determine the linear attenuation coefficient µ (in cm-¹) and the half value layer (in cm). Assume there is no scattering when the radiation interacts with the bone sample. Express the values to 3 significant figures, if necessary.arrow_forward
- After you calibrate the SpectroVis Plus spectrometer, you must a. run a full spectrum by selecting Sensors/Calibrate/Full Spectrum. O b. change the mode by selecting Sensors/Time-Based. Oc. collect a full spectrum of the sample to determine the wavelength of maximum absorbance. O d. change the mode by selecting Sensors/Data Collection.arrow_forwardYour pupils dilate when visible light intensity is reduced. Does wearing sunglasses that lack UV blockers increase or decrease the UV hazard to your eyes? Explain.arrow_forwardA pulsed laser produces brief bursts of light. One such laser emits pulses that carry 0.400 J of energy but last only 300 fs . Part A What is the average power during one of these pulses? Pav = 1.33x1012 W Submit Previous Answers Correct Part B Assuming the energy is emitted in a cylindrical beam of light 2.10 mm in diameter, calculate the average intensity of this laser beam. ? Iay = W/m? Submit Previous Answers Request Answer X Incorrect; Try Again; 5 attempts remaining Part C What is the rms electric field in this wave? ? Erms = V/m Submit Request Answerarrow_forward
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