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Chapter 32 Solutions
University Physics with Modern Physics (14th Edition)
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- Suppose a star 1000 times brighter than our Sun (that is, emitting 1000 times the power) suddenly goes supernova. Using data from Table 7.3: (a) By what factor does its power output increase? (b) How many times brighter than our entire Milky Way galaxy is the supernova? (c) Based on your answers, discuss whether it should be possible to observe supernovas in distant galaxies. Note that there are on the order of 1011 observable galaxies, the average brightness of which is somewhat less than our own galaxy.arrow_forward(a) Which line in the Balmer series is the first one in the UV part of the spectrum? (b) How many Balmer lines lie in the visible part of the spectrum? (c) How many Balmer lines lie in the UV?arrow_forward(a) Calculate the number of photoelectrons per second that are ejected from a 1.00-mm2 area of sodium metal by a 500-nm radiation with intensity I .30kW/m2 (the intensity of sunlight above Earth’s atmosphere). (b) Given the work function of the metal as 2.28 eV, what power is carried away by these photoelectrons?arrow_forward
- Our sun's 5800 K surface temperature gives a peak wavelength in the middle of the visible spectrum. What is the minimum surface temperature for a star whose emission peaks at some wavelength less than 400 nm? (i.e. in the ultraviolet)arrow_forwardThe wavelength of light emitted by a Carbon Dioxide laser is 10.6 micrometers. a) What is the frequency of the light and b) What part of the EM Spectrum is it. Look in the middle of the chart for the Type of Radiation where you see Radio Waves, Microwaves... etc. to make your selection? c) What are some detectable Objects at this frequency.arrow_forwardAssume the radiation from a heat lamp is monochromatic, with a wavelength of 1.5 μm . I =3.313 kW/m^2. a. What is the peak electric field strength, in kilovolts per meter? b. Find the peak magnetic field strength, in microtesla. c. How long, in seconds, will it take to increase the temperature of the 3.95-kg shoulder by 2.00°C, assuming that the shoulder absorbs all the radiation from the lamp and given that its specific heat is 3.47 × 103 J/(kg⋅°C)?arrow_forward
- (a) Calculate the wavelength of light in vacuum that has a frequency of 5.06 x 10 18 nm (b) What is its wavelength in flint glass? nm (c) Calculate the energy of one photon of such light in vacuum. Express the answer in electron volts. eV (d) Does the energy of the photon change when it enters the flint glass? The energy of the photon changes. The energy of the photon does not change. Hz. Explain.arrow_forwardA photon of ultraviolet (UV) light possesses enough energy to mutate a strand of human DNA. What is the energy of a single UV photon having a wavelength of 41 nm?arrow_forwardUse the following information to answer the next question A farmer uses a sunscreen that contains para-amino benzoic acid (PABA). Absorption Spectrum of PABA Absorption by PÁBA 220 230 240 250 260 270 280 290 300 310 320 330 340 Wavelength (nm) 26. The PABA in the sunscreen absorbs radiation that has a frequency of approximately O 8.0x1012 Hz O80 Hz O 8.8x10-16 Hz 1.1x1015 Hz Your reasoning: Written Response Relative degree of absorptionarrow_forward
- A. What is the energy of a 194.0MHz radio-frequency photon? B. What is the energy of a visible-light photon with a wavelength of 611.0nm? C. What is the energy of an x-ray photon with a wavelength of 0.236nm?arrow_forwardThe photoelectric effect can be used in engineering designs for practical applications. For example, infrared goggles used in night-vision applications have materials that give an electrical signal with exposure to the relatively long wavelength of IR light. If the energy needed for signal generation is 7.5 x 10-20 J, what is the minimum wavelength? What is the frequency of light that can be detected? c = 2.998 x 10 m/s h = 6.626 x 10-34 J s marrow_forwardThe photoelectric effect can be used in engineering designs for practical applications. For example, infrared goggles used in night-vision applications have materials that give an electrical signal with exposure to the relatively long wavelength of IR light. If the energy needed for signal generation is 6.4 x 10-20 J, what is the minimum wavelength? What is the frequency of light that can be detected? c = 2.998 x 10° m/s h = 6.626 x 10-34 J s s-1 Submit Answer Retry Entire Group No more group attempts remainarrow_forward
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