EBK PHYSICS FOR SCIENTISTS & ENGINEERS
5th Edition
ISBN: 9780134296074
Author: GIANCOLI
Publisher: VST
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Chapter 37, Problem 16Q
To determine
The difference between a photon and an electron.
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a.) In what part of the EM spectrum would a photon of energy 7.7 ✕ 10−23 J be found?
b.) What is its energy in electronvolts?
Just like the optical part of the spectrum, radio waves can be described in terms of photons - although they can be very difficult to detect. Consider the photons in radio waves from an FM station that has a 88.5-MHz broadcast frequency.
A. Find the energy, in joules, of a photon in the radio waves.
B. Find the energy, in electron volts, of a photon in the radio waves.
What is the energy of a photon that has the same wavelength as a 12-eV electron? (Ans. 3.5 keV)
Chapter 37 Solutions
EBK PHYSICS FOR SCIENTISTS & ENGINEERS
Ch. 37 - Prob. 1QCh. 37 - Prob. 2QCh. 37 - Prob. 3QCh. 37 - Prob. 4QCh. 37 - Prob. 5QCh. 37 - Prob. 6QCh. 37 - Prob. 7QCh. 37 - Prob. 8QCh. 37 - Prob. 9QCh. 37 - Prob. 10Q
Ch. 37 - Prob. 11QCh. 37 - Prob. 12QCh. 37 - Prob. 13QCh. 37 - Prob. 14QCh. 37 - Prob. 15QCh. 37 - Prob. 16QCh. 37 - Prob. 17QCh. 37 - Prob. 18QCh. 37 - Prob. 19QCh. 37 - Prob. 20QCh. 37 - Prob. 1PCh. 37 - Prob. 3PCh. 37 - Prob. 7PCh. 37 - Prob. 9PCh. 37 - Prob. 13PCh. 37 - Prob. 25PCh. 37 - Prob. 26PCh. 37 - Prob. 27PCh. 37 - Prob. 32PCh. 37 - Prob. 34PCh. 37 - Prob. 37PCh. 37 - Prob. 45PCh. 37 - Prob. 52PCh. 37 - Prob. 76GPCh. 37 - Prob. 77GP
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- Measurements indicate that an atom remains in an excited state for an average time of 50.0 ns before making a transition to the ground state with the simultaneous emission of a 2.1-eV photon. (a) Estimate the uncertainty in the frequency of the photon. (b) What fraction of the photon's average frequency is this?arrow_forwardAn X-ray tube has an applied voltage of 100 kV. (a) What is the most energetic X-ray photon it can produce? Express your answer in electron volts and joules. (b) Find the wavelength of such an X-ray.arrow_forwardExposure to a sufficient quantity of ultraviolet light will redden the skin, producing erythema—a sunburn. The amount of exposure necessary to produce this reddening depends on the wavelength. For a 1.0 cm2 patch of skin, 3.7 mJ of ultraviolet light at a wavelength of 254 nm will produce reddening; at 300 nm wavelength, 13 mJ are required.a. What is the photon energy corresponding to each of these wavelengths?b. How many total photons does each of these exposures correspond to?c. Explain why there is a difference in the number of photons needed to provoke a response in the two cases.arrow_forward
- The wavelengths of visible light range from approximately 400400 to 750 nm750 nm. Part (a) What is the minimum energy for a photon in this range? Give your answer in electron volts. Part (b) What is the maximum energy for a photon in this range? Give your answer in electron volts.arrow_forwardThe sky exhibits the color blue due to the scattering of sunlight by air molecules. The blue light has a frequency of about 7.5 x 10^14 Hz.a.) What is the wavelength (in nm) associated with this radiation? b.) How much is the energy (in Joules) of a single photon associated with this frequency?arrow_forwardPhoton Intensity 3. (a) If light is generated by 2 sources with wavelengths equal to 350 nm and 900 nm, will either one be absorbed by CdS? Explain your answer mathematically. (b) Determine the absorption coefficient for CdS for a wavelength of 900 nm. (c) What percentage of radiation is absorbed by 250 nm of CdS by light with this wavelength (900 nm)?arrow_forward
- What is the energy (in eV) of the following photons? A 200-nm photon of ultraviolet light?arrow_forwardIf a photon has energy of 4.3 eV, calculate its' wavelength. Report your answer in nm . Your Answer: Answerarrow_forwardAn electron is bound to a region of space by a springlike force with natural frequency 04.082 x 10¹5 rad/s. a) Find the ground state energy of this electron. Give your answer in units of eV. b) Suppose the electron absorbs a photon and jumps from the ground state to the first excited state. What is the wavelength of the photon? Give your answer in units of nm.arrow_forward
- What is the wavelength of the photon with energy E = 3.1 × 10-16 J. Use the unit of nm for the wavelengtharrow_forwardConsider a singly ionised helium atom whose single electron is in the ground state. Calculate the energy required to unbind this electron and determine the maximum wavelength of a photon that is able to provide this amount of energy. Choose the answer below that best matches your answer. Select one: а. 22.9 nm O b. 45 nm С. 228 nm O d. 9.1 nmarrow_forwardWhat is the wavelength, in nm, of a photon with energy (a) 0.30 eV, (b) 3.0 eV, and (c) 30 eV? For each, is this wavelength visible light, ultraviolet, or infrared?arrow_forward
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