When the object is placed on the focal f, what will be characteristics of the image formed

What type of nuclear decay causes the atomic number of an element to increase by 1?

At very high pressures, gases become and will eventually a) more dense; become hotter b) more dense; change to a liquid or solid c) less dense; combust d) less dense; turn into a liquid

In the first law of thermodynamics, triangle e=q-w, what does q stand for