Constants and Units

Question 1

c =

Speed of light in vaccuumn

Answer 1

= 2.988 × 10^8 m/s ≈ 3 × 10^8 m/s

= 1 / sqrt(ε_0 · μ_0)

Question 2

N_A =

Avogardo constant

Answer 2

6.022 × 10^23 1/mol

Question 3

e =

Electron charge

Answer 3

1.602 × 10^-19 C

Question 4

m_e =

Electron rest mass

Answer 4

0.5110 MeV

Question 5

m_p =

Proton restmass

Answer 5

938.3 MeV

Question 6

m_n =

Neutron rest mass

Answer 6

939.6 MeV

Question 7

ε_0 =

Electric constant / Vacuum permittivity

Answer 7

8.854 × 10^-12 C / (V · m)

ε_0 = 1 / (μ0 · c^2)

Question 8

μ_0 =

Magnetic constant

Answer 8

4π×10^−7 (V · s)/(A ·m)

Question 9

m_p/m_e = ..

Ratio of proton to electron rest mass

Answer 9

1836

Question 10

h = …

Plank constant

Answer 10

6. 626×10^−34 J /Hz

4. 136×10^−15 eV / Hz

Question 11

1 eV = …. J

Answer 11

eV = 1.602×10^−19 J = 1 V × e

(amount of kinetic energy gained by a single electron accelerating from rest through an electric potential difference of one volt in vacuum. )

Question 12

k = ….

Boltzmann constant

Answer 12

1.381×10^−23 J/K