1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
natima [27]
3 years ago
10

The human eye is a complex sensing device for visible light. The optic nerve needs a minimum of 2.0 × 10−17 J of energy to trigg

er a series of impulses that eventually reach the brain. How many photons of blue light (475 nm) are needed?
Chemistry
1 answer:
AveGali [126]3 years ago
7 0
Number of photons can be calculated by dividing the needed energy by the energy per photon.

The minimum energy needed is given as 2 x 10^-17 joules
Energy per photon = hc / lambda where h is planck's constant, c is the speed of light and lambda is the wavelength
Energy per photon = (<span>6.626 x 10^-34 x 3 x 10^8) / (475 x 10^-9)
                              = 4.18 x 10^-19 J

number of photons = (2 x 10^-17) / (4.18 x 10^-19)
                               = 47.79 photons which is approximately 48 photons</span>
You might be interested in
The diagram below shows the branching tree diagram for humans. The text box below it shows the set of derived shared characteris
pentagon [3]

Answer:

I would write "terrestrial/lives on land during all life stages" between the frog and pigeon branches

Explanation:

Jaw evolution has started with fish, so i'd place that before the perch, evolution of four limbs is next and I would plate it between the perch and the frog. Evolution of an egg has ensured that organisms remain terrestrial during all stages of life and don't need to rely on water to lay their eggs. So I would place that between the frog and the pigeon. True mammary glands and true hair, as we know it formed on mammals so i'd place that between the pigeon and the rats (although synapsids evolved similar structures long before birds even existed). And lastly, I would place "walking on two legs" between rats and human branches. Because our ancestors evolved bipedalism relatively late.

6 0
2 years ago
Give the answer to the problem below using the correct number of significant digits. (1.3 x 103) x (5.724 x 104)
Gemiola [76]
(133.9) x (595.296)= 79,710.1344
Answer with significant digits: 80,000
1.3 has two significant digits so 79,700 rounds up to 80000.
6 0
3 years ago
Read 2 more answers
In the process of electrolysis, current can flow through a liquid because A. water molecules become negatively charged. B. hydro
Liula [17]
<span>B. Hydrogen is electrically neutralized in the solution. Hydrogen is a chemical element with symbol H and atomic number 1. With a standard atomic weight of circa 1.008, hydrogen is the lightest element on the periodic table.</span>
4 0
3 years ago
Read 2 more answers
Which of the following environmental risks is most likely to lead to digestive health issues?
xz_007 [3.2K]
You haven’t listed answer choices for this question
5 0
3 years ago
Read 2 more answers
How many grams of chlorine are required to react with 5.00 moles of sodium to produce sodium chlorine?
Oduvanchick [21]

Answer:

2.5 mol Cl2 will react with 5 mol Na.

Explanation:

5 0
3 years ago
Read 2 more answers
Other questions:
  • What is the product when NH3 decomposes
    11·1 answer
  • The concentration of 1130+ in a solution is found to be 1.75 X 10-8 M 250C. Find [OH].
    11·1 answer
  • How does an atom-88 become a strontium ion with a +2 charge?
    7·1 answer
  • Which of the following does not serve as a way to neutralize the charge in a body?
    14·1 answer
  • How many moles of NaOH are required to prepare 2.90 L of 1.8 M NaOH?
    14·2 answers
  • Consider the role of third world countries in this system. How would they benefit or not benefit from a cap and trade system?
    12·1 answer
  • What is the formula for dihydrogen tetraoxide
    9·1 answer
  • What particle has a mass &amp; charge?
    13·1 answer
  • In the endothermic reaction below, how would adding heat affect the equilibrium of the system? (2 points)
    9·1 answer
  • What type of chemical reaction is the reaction below?Fe2O3 + 3 Mg --&gt; 2 Fe + 3 MgO
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!