Question

Exercise 4. Change the following affirmative sentences into negative sentences and vice versa without changing the meaning: 1. It was an extraordinary feat to perform. 2. She is always punctual.​

Answer 1

Answer:

Radiative transitions involve the absorption, if the transition occurs to a higher energy level, or the emission, in the reverse case, of a photon. Nonradiative transitions arise through several different mechanisms, all differently labeled in the diagram.

Answer 2

Answer:

1- It was not an extraordinary feat to perform.

2-She is never punctual.

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