What description below explains what happens to energy transfer in hot packs? ●energy is transferred from the system to the surroundings

●energy is transferred from the surroundings to the system

●energy is absorbed by the system​

Both models are effective because they show the valence electrons, and these valence electrons indicate the reactivity of an element.

The answer is not c

The answer is 5 10 15

The main types of electromagnetic radiation. radio  waves have  the lowest frequencies  and  longest  wavelengths, while gamma  waves have highest frequencies  and shortest wavelengths. the wavelengths vary across the electromagnetic spectrum from about 10–15 m to more than 104 m.hope it !