For the same amount of energy, the number of photons in red light will be greater than the number of photons in blue light.
This is because the energy carried by a photon is inversely proportional to the wavelength of the photon. A longer wavelength means there is a lower energy in the photons and a shorter wavelength means that there is a higher energy. Therefore, in order for the photons to deliver one joule of energy, more of the red light photons will be required.
Natural selection and selective breeding can cause both animal and plant changes. The distinction between the two is that natural selection occurs without human intervention, while selective breeding occurs only when humans interfere. As a result, selective breeding is also known as artificial selection.
Explanation:
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The pH of a solution is a measure of the acidity of a solution and is logarithmically related to the hydrogen ion concentration. It is expressed as:
pH = -log [H+]
We use this to determine the amount of H+ needed to adjust the pH to the desired value.
pH1 = 7.2 = -log [H+]
[H+] = 6.31x10^-8
pH2 = 8.2 = -log [H+]
[H+] = 6.31x10^-9
[H+] to be added = 6.31x10^-8 - 6.31x10^-9 = 5.68x10^-8 M
She should add an acidic solution with concentration 5.68x10^-8 M. Hope this helps.