Highest energy photon absorbed: ![2.18\cdot 10^{-18}J](https://tex.z-dn.net/?f=2.18%5Ccdot%2010%5E%7B-18%7DJ)
Explanation:
An atom is said to be (positively) ionised when it absorbs a photon, and as a consequence, an electron becomes energetic enough to escape the atom, leaving an excess of positive charge behind.
In order for the electron to escape, the energy of the absorbed photon must be exactly equal to the (negative) energy of the level in which the electron lies.
For an hydrogen atom, the energy levels are given by
![E_n = -13.6 \frac{1}{n^2}](https://tex.z-dn.net/?f=E_n%20%3D%20-13.6%20%5Cfrac%7B1%7D%7Bn%5E2%7D)
where this energy is measured in electronvolts, and n is the number of the energy level.
Since the energy is negative, this means that the electron which requires most energy is the one lying in the ground state (n=1). Therefore, for an electron in the ground state, the most energy that can be absorbed from the incoming photon is
![E_1 = -13.6 eV](https://tex.z-dn.net/?f=E_1%20%3D%20-13.6%20eV)
Converting into Joules, this is equal to
![E_1 = 13.6 \cdot 1.6\cdot 10^{-19}=2.18\cdot 10^{-18}J](https://tex.z-dn.net/?f=E_1%20%3D%2013.6%20%5Ccdot%201.6%5Ccdot%2010%5E%7B-19%7D%3D2.18%5Ccdot%2010%5E%7B-18%7DJ)
Learn more about hydrogen atom:
brainly.com/question/2757829
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Answer:
A. The athlete isn’t doing any work because he doesn’t move the weight.
Explanation:
We must remember the definition of work, which says that work is equal to the product of mass by the distance displaced. In this case, the athlete only does work when he lifts the weight from the ground to the point where he holds the weight suspended.
So when he's holding the weight, he doesn't do any work.
When a circuit is complete, or closed, electrons can flow from one end of a battery all the way around, through the wires, to the other end of the battery. Along its way, it will carry electrons to electrical objects that are connected to it – like the light bulb – and make them work!
The category of galaxy which does not have a distinctive shape is D. an irregular galaxy.
A spiral galaxy has a spiral shape, an elliptical galaxy has an elliptical shape, and a barred-spiral galaxy has a barred-spiral shape. The only galaxy type which does not have a constant shape is an irregular galaxy.