Using F=Ma
where a= F/M = 12/3 = 4ms-²
You should write ' 4 ' in the first box,
and ' m/s² ' in the second box.
Since the electron dropped from an energy level i to the ground state by emitting a single photon, this photon has an energy of 1.41 × 10⁻¹⁸ Joules.
<h3>How to calculate the photon energy?</h3>
In order to determine the photon energy of an electron, you should apply Planck-Einstein's equation.
Mathematically, the Planck-Einstein equation can be calculated by using this formula:
E = hf
<u>Where:</u>
In this scenario, this photon has an energy of 1.41 × 10⁻¹⁸ Joules because the electron dropped from an energy level i to the ground state by emitting a single photon.
Read more on photons here: brainly.com/question/9655595
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Answer: C. 12.6
Explanation: 2*pi*1.8= 11.304
11.304/0.9= 12.56
It looks blue as it is only reflecting blue light
