Which gravitational force field dagram is drawn correctly?

What are the applications of electromagnetic waves

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

Select for each of the following statements whether it is correct or incorrect. (a) in an isothermal expansion of an ideal gas. (b) the temperature remains constant. (b) the pressure remains constant. (c) there is work done by the gas. (d) there is heat added to the gas. (e) the change in internal energy equals zero.