The human eye is most sensitive to green light of wavelength 505 nm . Experiments have...

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.
1.What is the frequency of this photon?
2.How much energy (in joules and eV ) does it deliver to the receptor cells?
3.To appreciate what a small amount of energy this is, calculate how fast a typical bacterium of mass 9.50�10?12 g would move if it had that much energy.

Solutions

Expert Solution

1) c = frequency*wavelength
c = 299792458 m/s
wavelength = 505nm = 5.05e-7 m

so frequency = 5.94e14 Hz

2)
E = h*frequency = 3.93e-19J

1 J = 6.26e18 eV
so this energy in eV = 3.93e-19*6.24e18 = 2.452 eV

3)
(1/2)mv^2 = 3.93e-19

so, v = 9.096 mm/s

genius_generous answered 1 year ago

Next > < Previous

Related Solutions

The human eye is most sensitive over the same wavelength range at which the Sun emits...

The human eye is most sensitive over the same wavelength range at which the Sun emits the greatest intensity of radiation. The Sun is a G-type star; see Table 17.1 in Section 17.2 for this classification scheme. Suppose creatures were to evolve on a planet orbiting a star somewhat hotter than the Sun, let’s say an average F-type star. Let’s also assume that the atmospheric properties of their planet are the same as we find on earth today. To what...

In the photoelectric experiment, green light, with a wavelength of 522 nm is the longest-wavelength radiation...

In the photoelectric experiment, green light, with a wavelength of 522 nm is the longest-wavelength radiation that can cause the photoemission ofelectrons from a clean sodium surface. a) What is the work function of sodium, in electron-volts? b) If UV (ultraviolet) radiation of wavelength 250 nm is incident to the sodium surface, whatwill be the kinetic energy of the photoemitted electrons, in electron-volts?

1, Which carries more energy, yellow light with a wavelength of 580 nm or green light...

1, Which carries more energy, yellow light with a wavelength of 580 nm or green light with a wavelength of 560 nm? (Explain or show a calculation). 2,Why do we see a characteristic color (in the flame) for each cation? 4,The energy of an electron in n = 1 for a hydrogen atoms was found to be -2.179 x10-18 J/atom. Convert this value to kJ/mole. 5,Calculate the energy of light emitted when an electron changes from n = 3 to...

In a diffraction grating experiment, green light of wavelength λ = 533 nm is directed on a...

In a diffraction grating experiment, green light of wavelength λ = 533 nm is directed on a diffraction grating that has N = 577 /mm lines. The diffraction pattern is projected on a screen that's located 172.5 (cm from the grating. Find the distance between the first bright fringe and third dark fringe on the screen. your answer should be in SI units (meters) This is a diffraction grating problem, you can not use the approximation

While the human eye responds to light with wavelengths up to about 750 nm, it is...

While the human eye responds to light with wavelengths up to about 750 nm, it is hard to distinguish the color of different wavelengths between 650 and 700 nm. Why?

What is the thinnest film that produces a strong reflection for green light with a wavelength of 500 nm?

A very thin oil film (n=1.25) floats on water (n=1.33). What is the thinnest film that produces a strong reflection for green light with a wavelength of 500 nm? d=________nm

The wavelength of the green light in the plastic will be

The next three questions pertain to a certain green light that has a wavelength of 600nm is vacuum. The refractive index of a certain plastic is 1.2.The wavelength of the green light in the plastic will beGroup of answer choices120 nm.240 nm.400 nm.500 nm.720 nm.

1N - Part 1 In a functioning human eye, light enters the human eye through the...

1N - Part 1 In a functioning human eye, light enters the human eye through the lense and reaches the retina. What does the retina interpret or record the light as and what type of message does it convert it into? 1N - Part 2 In regard to the above, where does the retina send the message it converts light into to, and through which nerve does it send it? 1N - Part 3 If a person’s eye is damaged...

A distant galaxy emits light that has a wavelength of 596.8 nm. On earth, the wavelength...

A distant galaxy emits light that has a wavelength of 596.8 nm. On earth, the wavelength of this light is measured to be 601.9 nm. (a) Decide whether this galaxy is approaching or receding from the earth. (b) Find the speed of the galaxy relative to the earth. (Give your answer to 4 significant digits. Use 2.998 × 108 m/s as the speed of light.)

Light of wavelength 600 nm is incident on a pair of slits 2,000 nm apart. Find...

Light of wavelength 600 nm is incident on a pair of slits 2,000 nm apart. Find the angular deviation of (a) the first minimum, (b) the first, second, and third maxima above the central one. (c) What is the longest wavelength for which there are four maxima above the central one? (d) The same light is incident on a diffraction grating with adjacent slits 2,000 nm apart. Compare and contrast the resulting interference pattern with that of the two-slit system.

Subjects