The microwaves in an oven are of a specific frequency that will heat the water molecules contained in food. (This is why most plastics and glass do not become hot in a microwave oven-they do not contain water molecules.) This frequency is about 3 × 109 Hz. What is the energy of one photon in these microwaves?

about 2 x 10^-24 J

Explanation:

frequency (ν) = 3 x 10^9 Hz

We have the frequency and we're trying to find the energy of a photon so we will be using the formula...

E = hν

where 'h' is Planck's constant:  6.626 × 10^−34 joule seconds (J s).

Plug the numbers in...

E = (6.626 × 10^−34 Js)(3 x 10^9 Hz)

E = 1.9878 x 10^-24 J

E ≈ 2 x 10^-24 J

b false

why do the isotopes of a particular element behave differently in nuclear reactions but the same in chemical reactions? chemical reactions involve changes to electrons in an atom; isotopes do not differ in electrons, and so they react the same way during chemical changes.