Equations

Question 1

c = lamba*v

Answer 1

speed of light (m/s) = wavelength (m) * frequency (1/s)

Question 2

c (constant)

Answer 2

speed of light

3.00 x 10^8 m/s

Question 3

E = hv = hc/lambda

Answer 3

energy in a photon (J) = Planck’s constant (J*s) * frequency (1/s)

Question 4

h (constant)

Answer 4

Planck’s constant = 6.626 x 10^-34 J*s

Question 5

fi = hv

Answer 5

threshold frequency condition (J) = Planck’s (J*s) * frequency (1/s)

binding energy required to emit an electron

Question 6

KE = hv - fi

Answer 6

KE of an ejected electron is E - binding E (J)

Question 7

lambda = h/(mv)

Answer 7

de Broglie relation

wavelength (m) = Planck’s (J*s)/(mass (kg) * velocity (m/s))
*kg because of J units

Question 8

delta x * m*delta v > or = to h/(4pi)

Answer 8

Heisenberg uncertainty principle

uncertainty in position * uncertainty in velocity * mass greater than or equal to Planck’s over 4pi

Question 9

E(n) = -2.18 x 10^(-18) J *(1/n^2)

Answer 9

energy of an electron in an orbital with quantum number n

for hydrogen atom

Question 10

delta E = -2.18 x 10^(-18) J [1/nf^2 - 1/ni^2]

Answer 10

change in energy level when electron changes energy levels

for hydrogen atom

Question 11

delta E (atom) = -E (photon)

Answer 11

E emitted by atom carried away by photon