Question

A metal foil has a threshold frequency of 5.45 x 10^14 HzWhich of the colors of visible light have enough energy to eject electrons from this metal. red orange yellow green blue violet indigo 1 following

Answer 1

Answer:

Green light

Explanation:

To solve the problem, we need to evaluate which wavelength of light corresponds to the threshold frequency of the metal

The relationship between frequency and wavelength is:

$\lambda=\frac{c}{f}$

where

$c=3\cdot 10^8 m/s$ is the speed of light

$f=5.45\cdot 10^{14}Hz$ is the frequency

Substituting into the formula,

$\lambda=\frac{3\cdot 10^8 m/s}{5.45\cdot 10^{14} Hz}=5.50\cdot 10^{-7}m=550 nm$

And wavelength of 550 nm corresponds to green light.