A defibrillator delivers about 300 joules per shock calculate the number of calories
1 answer:
Answer:- 71.7 calories
Solution:- it is a unit conversion problem where we need to convert joules into calories.
The unit conversion for these energy units is:
1 calorie = 4.184 joule
The given energy is 300 joules and has to be converted to calories. We will show the set up using dimensional analysis.
= 71.7 calories
So, the energy in calories is 71.7.
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<u>Answer:</u>
<u>Bohr's Model postulates-</u>
I postulate - The electrons in an atom orbit around the nucleus in definite circular paths called orbits or shells.
II Postulate - Each shell or orbit represents a specific amount of energy.
III Postulate - By emitting or absorbing energy, an electron may shift from one stationary energy orbit to another.
<u>Three main Limitations -</u>
1- It adjusts to the hydrogen atom's spectrum but not to the spectra of other atoms.
2 - In the definition of the electron as a tiny particle that spins around the atomic nucleus, the wave properties of the electron are not described.
3- Bohr is unable to understand why classical electromagnetism is inapplicable to his model. That is why, when electrons are in a stationary orbit, they do not emit electromagnetic radiation.
Explanation:
<u>About Bohr's postulates-</u>
1 - The electron spins in circling circles around the nucleus, emitting no energy. The orbital angular momentum is constant in these orbits.
Only certain radii of orbits, corresponding to certain given energy levels, are required for electrons in an atom.
2- Not every orbit is possible. However, whenever an electron is in a legal orbit, it is in a state of unique and constant energy and does not emit energy (stationary energy orbit).
<u>For example -</u> The energies allowed for electrons in the hydrogen atom are given by the following equation: The Rydberg constant for the hydrogen atom is in this equation, and n = quantum number will range from 1 to ∞. For each of the values of n, the electron energies of a hydrogen atom produced by the above equation are negative. As n rises, the energy becomes less negative and thus rises.
3- By emitting or absorbing energy, an electron may shift from one stationary energy orbit to another.
The energy difference between the two states would be equal to the energy released or consumed. This energy E is in the form of a photon, and it can be measured using the following formula:
E is the energy (absorbed or emitted) in this equation, and h is the Planck constant (its value is ) and v denotes the frequency of light, which is calculated in 1/ s.