Answer:
it could depend on the environment of the area, how the sun rays are parting through particles in the air, or it jus might be the amount of heat radiation is coming down cause it could be a chilly sunny day or a hot sunny day
Answer: <span>Fuel cells do not need an extra or rechargeable battery to operate the electronics.
Explanation:
The fuel cells are the batteries pe se. The cars do not need an extra battery and the batteries are not rechargeable.
The cells produce the electric power from the combination of hydrogen and oxygen.
</span>Regarding the other choices, fuel cells use hydrogen gas which needs high pressure, resulting in requiring <span>heavy steel tanks and isolation.
Of course the hydrogen gas is not as wideley distributed
throughout the country as conventional fuel.
And the tecnology is yet expensive.</span>
The Concenteration of a solution that has an absorbance of 0.420
is 5.27 μМ
<h3> </h3><h3>What is Absorbance ?</h3>
Absorbance (A), also known as optical density (OD), is the quantity of light absorbed by a solution.
Transmittance is the quantity of light that passes through a solution.
We can measures the absorbance of a sample using a spectrophotometer and the value is A = 0.420.
We can calculate the concentration of the sample using the Beer-Lambert law, which relates the attenuation of light to the properties of the material through which the light is travelling, through the following equation.
A = ∈ x c x d
Where ;
- A = Absorbance
- ∈ = molar absorptivity of the species (7.96 × 10⁴ M⁻¹ cm⁻¹)
- c = concentration
- d = optical path length (1.00 cm)
Therefore,
c = A / ∈ x d
= 0.420 / 7.96 × 10⁴ M⁻¹ cm⁻¹ x 1.00 cm
= 5.27 μМ
Learn more about spectrophotometer here ; brainly.com/question/20956841
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