7. which is the relationship between photon energy and frequency?
all photons have the same energy and frequency.
high-energy photons have high frequencies.
high-energy photons have low frequencies.

Apossible explanation for a set of facts that can be tested by further investigation is called

Which of these metals are magnetic?

In a heat engine if 1000 j of heat enters the system and the piston does 500j of work, what is the final internal energy of the system if the inital energy was 2000 j1.write the equation2.list out your known variables 3. plug the numbers into the equations4.solve 5.write your solution statement that includes initial energy and final energy added.