Science stemscopes- how does the number of atoms or molecules in a stystem affect its thermal energy

Determine the wavelength of the light absorbed when an electron in a hydrogen atom makes a transition from an orbital in the n=3 level to an orbital in the n=7 level.

In france, grapes are 1.95 euros per kilogram. what is the cost of grapes, in dollars per pound, if the exchange rate is 1.14 dollars/euro? (2.6)

Consider the story you just read. all but one of the choices below indicate that something is living.