Answer:
The colors of visible light that have enough energy to eject electrons from this metal?
g. Violet
f. Indigo
e. Blue (Cyan)
d. Green
Explanation:
1) Visible light frequency spectrum:
You need to look for the spectrum of frequencis of the visible light in a textbook or internet.
This is such spectrum:
Violet 680–790 THz
indigo 620–680 THz
Cyan 600–620 THz
Green 530–600 THz
Yellow 510–530 THz
Orange 480–510 THz
Red 405–480 THz
2) Photoelectric effect
The photoelectric effect is the emission of electrons from a metal surface when a ray of light of enough energy shines on the surface of the metal.
The energy of ligth is directly related to the frequency, as the Planck - Einsen's equation shows:
Where
3) If the frequency of the ligth is below the threshold frequency of the metal, the electrons will not be emited.
Taking into account that 1 T unit = 10¹² units, 5.45 × 10¹⁴ Hz = 545 × 10¹² Hz = 545 THz, the coiors with frequency below 545 THz will not eject electrons from this metal.
These are the color which does have enough energy to eject electrons from this metal:
g. Violet 680–790 THz
f. Indigo 620–680 THz
e. Blue (Cyan) 600–620 THz
d. Green 530–600 THz
