physical chemistry

2. The retina of a human eye can detect light when radiant energy incident on it is at least 4.0X10-17 J. For light of 600-nm wavelength, how many photons does this correspond to?

  1. 👍 0
  2. 👎 1
  3. 👁 2,034
asked by sargam

  1. Photon energy = h*c/(wavelength)
    = 6.62*10^-34 J*s * (3*10^8 m/s)/600*10^-9 m = 3.3*10^-19 J

    4*10^-17 J corresponds to 120 photons of that color (orange) light

    1. 👍 0
    2. 👎 5
    posted by drwls

Respond to this Question

First Name

Your Response

Similar Questions

  1. chemistry

    the retina of a human eye can detect light when radiant energy incident on it is at least 4.0x10^-17 J. For light that is 565 nm wavelength, how many phontons does this energy correspond to?

    asked by Any on February 1, 2012

  2. Chemistry

    The retina of a human eye can detect light when radiant energy incident on it is at least 4.0x10^(-17)J. For light of 535nm (5.35x10^(-7) m) wavelength, how many PHOTONS does this energy correspond to?

    asked by Anonymous on November 20, 2010

  3. microscope

    list lenses in light path between spcimen viewed with compound light microscope and its image on the retina of the eye http://www.microscope-microscope.org/basic/microscope-parts.htm gives the lenses and other parts. The image

    asked by paul on September 19, 2006

  4. chemistry

    The human eye responds to a light stimulus (generates a sensation of "light") upon receiving light energy of 10eV (and more). If we take 6000 angstroms as the average wavelength, how many photons must the eye receive to register a

    asked by Peter on December 19, 2013

  5. health

    12. A person with an injury to the extrinsic muscles of the eye would find it difficult to A. focus light onto the retina. B. interpret visual input. C. move the eyeball. D. control the amount of light entering the eye. Maybe C.?

    asked by Jackie on June 28, 2010

  6. Biology

    The human retina has an area of about 1000 mm^2. If we have a total of 125 million rods and 6.5 million cones in each eye, show that we have about 131,500 sensory cells per square millimeter in the retina.

    asked by Stephanie on March 3, 2011

  7. retina

    Why can a blow to the front of the eye result in damage to the retina of the eye? See http://www.aafp.org/afp/20040401/1691.html for an explanation in medical terms. The entire eye is affected by the pressure wave resulting from

    asked by Lisa on June 16, 2006

  8. physics II

    the lens to retina distance in the human eye averages 2.0cm what is the power of the lens of the human eye

    asked by kb on July 20, 2011

  9. physics

    An owl has good night vision because its eyes can detect a light intensity as small as 5.0*10^-13 W/m2. What is the minimum number of photons per second that an owl eye can detect if its pupil has a diameter of 7.0 mm and the

    asked by rick on April 14, 2008

  10. biology

    What part absorbs light and converts it into nerve impulses What part bends light that enters the eye so that what you see is focused on your retina What part transfers the image the eye sees to the brain for perception

    asked by sandra on May 20, 2014

More Similar Questions