Which of the following relationships is true? Group of answer choices

a sound wave is an example of electromagnetic radiation

very hot objects emit shorter wavelength radiation than cooler objects

hot objects have long wavelengths

wavelength is directly proportiona to frequency

In a heat engine of 1000 j of heat enters the system and the piston does 500 j of work what is the final internal energy of the system if the inital energy was 2000 j we have to do all of these down here 1)write the equation 2)list out your know variables 3)plug the numbers into the equations 4)solve 5)write your solution statemtn that includes inital energuy and final energuy added