Question

The wavelength of green light from a traffic signal is centered at 5.20x10^-7m. Calculate the energy.

Answer 1

Answer:
`\text{Energy = }3.825*10^(-19)J`

Explanations:

The wavelength is represented by λ

`\lambda\text{ = 5.20 }*10^(-7)m`

The speed of light is represented by c

`c\text{ = 3 }*10^8m\text{ /s}`

The planck's constant is given as:

`h\text{ = 6.6}3\text{ }*10^(-34)Js`

The energy of light is calculated using the formula below:

`E\text{ = }(hc)/(\lambda)`

Substituting the values of h, c, and λ into the formula above:

`\begin{gathered} E\text{ }=\text{ }(6.63*10^(-34)*3*10^8)/(5.20*10^(-7)) \\ E\text{ = }3.825*10^(-19)J \end{gathered}`

The energy is therefore:

`3.825*10^(-19)J`