Modern Physics For Scientists And Engineers
Modern Physics For Scientists And Engineers
2nd Edition
ISBN: 9781938787751
Author: Taylor, John R. (john Robert), Zafiratos, Chris D., Dubson, Michael Andrew
Publisher: University Science Books,
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Chapter 4, Problem 4.9P
To determine

(a)

Whether low-intensity microwave radiation with wavelength 1cm break a bond or not.

To determine

(b)

The minimum wavelength required to break the 4eV chemical bond.

To determine

(c)

The type of photon for the minimum wavelength.

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The human eye is most sensitive to green light of wavelength 505 nm. Experiments have found that when people are kept in a dark room until their eyes adapt to the darkness, a single photon of green light will trigger receptor cells in the rods of the retina. (a) What is the frequency of this photon? (b) How much energy (in joules and electron volts) does it deliver to the receptor cells? (c) To appreciate what a small amount of energy this is, calculate how fast a typical bacterium of mass 9.5 x 10-12 g would move if it had that much energy
The average threshold of dark-adapted (scotopic) vision is 4.00 x 10-11 W/m? at a central wavelength of 500 nm. If light having this intensity and wavelength enters the eye and the pupil is open to its maximum diameter of 8.50 mm, how many photons per second enter the eye?
About 0.1 eV is required to break a "hydrogen bond" in a protein molecule.(a) Calculate the minimum frequency of a photon that can accomplish this.(b) Calculate the maximum wavelength of a photon that can accomplish this.
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