Physics Mod 4 Chapter 13 - Quantum Physics

Question 1

What is Avogadro’s Constant?

Answer 1

6.02*10^23

Question 2

What is a photon?

Answer 2

A quantum (packet) of electromagnetic energy.

Question 3

True or False:
The energy of a photon is inversely proportional to its frequency.

Answer 3

False, the energy of a photon is directly proportional to its frequency. (High freq. EM waves have more energy than low freq. EM waves)

Question 4

What are the units of the Planck Constant?

Answer 4

J s

Question 5

What formula links Energy (E), Frequency (f), and the Planck Constant (h)?

Answer 5

E = fh

Question 6

What formula links Energy (W), the Planck Constant (h), the speed of light (c) and wavelength (λ)

Answer 6

W = (hc)/λ

Question 7

For very small or very large amounts of energy, Joules isn’t a good unit to use. What unit do we use for large amounts of energy?

Answer 7

Kilowatt hour (kwh)

Question 8

For very small or very large amounts of energy, Joules isn’t a good unit to use. What unit do we use for small amounts of energy?

Answer 8

electronvolt (eV)

Question 9

What is an electronvolt?

Answer 9

The energy gained by an electron when it moves through a p.d. of 1 volt.

Question 10

What equation links the electronvolt (eV), Energy (W), and the charge of an electron (q)

Answer 10

W = eVq

Question 11

What is the transfer equation in terms of electronvolts?