<span>A. the number of perching birds present</span>
Waterways or lakes. at least that’s what google said lol.
The spectrum goes as follows:
red, orange, yellow, green, blue, indigo and violet
Red has the lowest frequency.
Since frequency is inversely proportional to the wavelength, therefore, red has the longest wavelength.
Now, consider, the equation:
E = (hc) / lambda
Since the energy is inversely proportional to the wavelength, therefore, red will have the lowest energy.
Based on this, for the mentioned question:
1- Red has longer wavelength
2- Green has greater frequency
3- Green has greater energy
Answer:
2.5 mole of O2
Explanation:
From the equation we see that we need 5 molecules of oxygen to react with 2 molecules of C2H2.
This means that 5 moles of oxygen molecules are needed to completely react with 2 moles of C2H2, because a mole is a unit of particle count.
From that we can infer that to react with 1 mole of C2H2 we need half of 5 moles of oxygen - so 2.5 mole of oxygen molecules.