Which of the following equations can be used to determine the change in enthalpy of a system?

Cobalt-60 is an artificial radioisotope that is produced in a nuclear reactor and is used as a gamma-ray source in the treatment of certain types of cancer. if the wavelength of the gamma radiation from a cobalt-60 source is 1.00 × 10-3 nm, calculate the energy of a photon of this radiation.

When a spring is compressed, the energy changes from kinetic to potential. which best describes what is causing this change?

How does the viscosity of magma change as magma cools?