Concept explainers
The amount of energy of a photon of ultraviolet light greater than the energy of an average photon of visible light.
Answer to Problem 9PEB
The energy of a photon of ultraviolet light is
Explanation of Solution
Write the expression for the energy of a photon.
Here,
Write the expression for the
Here,
Substitute
Write the expression for the difference in energy of ultraviolet light and the visible light.
Here,
Conclusion:
Substitute
Substitute
Substitute
Therefore, the energy of a photon of ultraviolet light is
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Chapter 7 Solutions
Integrated Science
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- Photons of a certain infrared light have an energy of 1.33 * 10-19 J. (a) What is the frequency of this IR light? =______Hz(b) Use λ = c/f to calculate its wavelength in nanometers. =_____nmarrow_forwardGamma rays are photons with very high energy. How many visible-light photons with a wavelength of 500 nm would you need to match the energy of a gamma-ray photon with energy 7.1 x 101J ? 6800 b) 1.1 x 1010 2.5 x 108 0.8 x 106 1.8 x 106arrow_forwardWhat is the wavelength of an X-ray photon with energy 9.0 keV (9000 eV)?arrow_forward
- Consider the four scenarios involving visible light. In scenario A, visible light has a wavelength of 729.9 nm.729.9 nm. Determine its frequency, energy per photon, and color. frequency: s−1−1 energy per photon: J The visible light in scenario A is In scenario B, visible light has a frequency of 5.695×1014 s−1.5.695×1014 s−1. Determine its wavelength, energy per photon, and color. wavelength: nm energy per photon: J The visible light in scenario B is In scenario C, visible light is in the middle of the yellow region of the visible spectrum. Estimate its wavelength, frequency, and energy per photon. wavelength: nm frequency: s−1−1 energy per photon: J In scenario D, visible light has a photon energy of 4.346×10−19 J.4.346×10−19 J. Determine its wavelength, frequency, and color. wavelength: nm frequency:…arrow_forwardSuppose a star with radius 8.69 x 10° m has a peak wavelength of 684 nm in the spectrum of its emitted radiation. (a) Find the energy of a photon with this wavelength. 0.029e-17 J/photon (b) What is the surface temperature of the star? 4274.3 X K (c) At what rate is energy emitted from the star in the form of radiation? Assume the star is a blackbody (e = 1). 1.9934e17 Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. W (d) Using the answer to part (a), estimate the rate at which photons leave the surface of the star. X photons/sarrow_forwardFind the energy of the following. Express your answers in units of electron volts, noting that 1 eV = 1.60 × 10-1⁹ J. (a) a photon having a frequency of 5.60 x 1017 Hz Ⓒev (b) a photon having a wavelength of 4.40 x 10² nm eVarrow_forward
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