Answer:
a) Φ = 4.97 eV, b) the Planck model, it assumes that the frequencies are discrete and therefore it raises a discrete expression for the energi
E = h f
c) p / A = 7.66 10⁶ W / m²
Explanation:
a) the photoelectric effect was described by Einstein, assuming the existence of light quanta, which is why it is described by the equation
h f = K + Ф
in this case the speed of light is
c = λ f
h c / λ = K + Φ
if we assume that the scientific energy of the electrocutors is zero
hc / λ = fi
Φ = 6.63 10⁻³⁴ 3 10⁸/250 10⁻⁹
Φ = 7,956 10⁻¹⁹ J
reduced to eV
Φ = 7,956 10⁻¹⁹ (1 ev / 1.6 10⁻¹⁹ J)
Φ = 4.97 eV
b) in the Rayleigh-Jean model the quantities are all continuous, but does not explain phenomenon at high energy
In the Planck model, it assumes that the frequencies are discrete and therefore it raises a discrete expression for the energi
E = h f
temperature is a continuous variable in both models
c) the power emitted by a black body is given
P = σ A e T⁴
for a black body, emicivity is one
P / A = σ T⁴
let's use Wien's law of displacement to find the temperature
λ T = 2,898 10⁻³
T = 2,898 10⁻³ / λ
T = 2,898 10⁻³ / 850 10⁻⁹
T = 3,409 10³ K
we calculate
P / A = 5,670 10⁻⁸ 3409⁴
p / A = 7.66 10⁶ W / m²
d) The Bohr model is slightly modified to include the atoms with an electron
En = - k e2 / 2 ao (Z2 / n2)
r = n2 ao / Z
