If you want to change the thermos into an open energy system, you have to remove the lid. Once the lid is removed, the energy is no longer contained inside the thermos bottle. From the bottle, the energy dissipates to the environment.
There’s no picture or question
Explanation:
Given that,
Wavelength of the photon, ![\lambda=300\ nm=3\times 10^{-7}\ m](https://tex.z-dn.net/?f=%5Clambda%3D300%5C%20nm%3D3%5Ctimes%2010%5E%7B-7%7D%5C%20m)
Work function of the metal, ![\phi=1.13\ eV=1.81\times 10^{-19}\ J](https://tex.z-dn.net/?f=%5Cphi%3D1.13%5C%20eV%3D1.81%5Ctimes%2010%5E%7B-19%7D%5C%20J)
We need to find the maximum kinetic energy of the ejected electrons. It can be calculated using Einstein's photoelectric equation as :
![hf=E_k+\phi](https://tex.z-dn.net/?f=hf%3DE_k%2B%5Cphi)
![E_k=hf-\phi](https://tex.z-dn.net/?f=E_k%3Dhf-%5Cphi)
![E_k=h\dfrac{c}{\lambda}-\phi](https://tex.z-dn.net/?f=E_k%3Dh%5Cdfrac%7Bc%7D%7B%5Clambda%7D-%5Cphi)
![E_k=6.63\times 10^{-34}\times \dfrac{3\times 10^8}{3\times 10^{-7}}-1.81\times 10^{-19}](https://tex.z-dn.net/?f=E_k%3D6.63%5Ctimes%2010%5E%7B-34%7D%5Ctimes%20%5Cdfrac%7B3%5Ctimes%2010%5E8%7D%7B3%5Ctimes%2010%5E%7B-7%7D%7D-1.81%5Ctimes%2010%5E%7B-19%7D)
![E_k=4.82\times 10^{-19}\ J](https://tex.z-dn.net/?f=E_k%3D4.82%5Ctimes%2010%5E%7B-19%7D%5C%20J)
![E_k=3.01\ eV](https://tex.z-dn.net/?f=E_k%3D3.01%5C%20eV)
or
![E_k=3\ eV](https://tex.z-dn.net/?f=E_k%3D3%5C%20eV)
So, the maximum kinetic energy of the ejected electrons is 3 ev. Hence, this is the required solution.
Answer:
The cardiovascular system
Explanation: