In trying to differentiate between chronic bronchitis and emphysema, you know that chronic bronchitis:
1. usually occurs after age 50 and has insidious progressive dyspnea.
2. usually presents with a cough that is mild and with scant, clear sputum, if any.
3. presents with adventitious sounds, wheezing and rhonchi, and a normal percussion note.
4. results in an increased total lung capacity with a markedly increased residual volume.

The correct answer is option 3.

Explanation:

Chronic bronchitis normally occurs with respiratory infection after the age of 35 where is emphysema occurs after the age of 50. There is usually a persistent,

productive cough of copious mucopurulent sputum where is in emphysema there is no cough or scant if any high breathing sound.

Thus, the correct answer is option 3.

the transfer of energy between two molecules spaced just nanometers apart plays a key role in many technologies, including photovoltaics, quantum information systems, lighting, and sensors, as well as in biophysics to measure nanometer distances and in photosynthesis. but an open question in this area is what effect, if any, the surrounding photonic environment has on this nanoscale energy transfer. by designing and performing a carefully controlled experiment to answer this question, scientists have settled the debate and found clues to improving the efficiency of many of the technologies that rely on this process.

explanation: