Your landscape maintenance person is only allowed by state law to trim branches from trees up to a height of 15 feet without having a special license for tree work. You want todetermine the height of a tree in your back yard to see if he can trim it all the way to the top. On a sunny day, you notice that the tree casts a shadow on the flat ground. Armedwith a tape measure and a protractor, you run out into your back yard. The length of the shadow cast by the tree is 10.6 ft. You quickly set up your protractor and measure that theSun is 57.2° above the horizon. What is the height of the tree (in ft)? Find 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 7.80 x 1017 HzeV(b) a photon having a wavelength of 2.00 x 10² nmeV

Answered: Image /qna-images/answer/8e2dafb9-af18-4d8f-9486-3c02a0a0b625.jpg

Find 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 7.80 x 10¹7 Hz eV (b) a photon having a wavelength of 2.00 x 10² nm eV

Find 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 7.80 x 10¹7 Hz eV (b) a photon having a wavelength of 2.00 x 10² nm eV

Modern Physics

3rd Edition

ISBN:9781111794378

Author:Raymond A. Serway, Clement J. Moses, Curt A. Moyer

Publisher:Raymond A. Serway, Clement J. Moses, Curt A. Moyer

Chapter3: The Quantum Theroy Of Light

Section: Chapter Questions

Problem 40P

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Concept explainers

Nature of light

Light is transverse and electromagnetic radiation that exhibits the properties of a wave as well as a particle. For this reason, light is said to have a “dual nature.”

Question

Your landscape maintenance person is only allowed by state law to trim branches from trees up to a height of 15 feet without having a special license for tree work. You want to
determine the height of a tree in your back yard to see if he can trim it all the way to the top. On a sunny day, you notice that the tree casts a shadow on the flat ground. Armed
with a tape measure and a protractor, you run out into your back yard. The length of the shadow cast by the tree is 10.6 ft. You quickly set up your protractor and measure that the
Sun is 57.2° above the horizon. What is the height of the tree (in ft)?

Find 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 7.80 x 1017 Hz
eV
(b) a photon having a wavelength of 2.00 x 10² nm
eV

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