Question

Green plants absorb sunlight to power photosynthesis, the chemical synthesis of food from water and carbon dioxide. The compound responsible for light absorption and the color of plants, chlorophyll, strongly absorbs light with a wavelength of 430 nm. Calculate the frequency of this light. Round your answer to 3 significant digits.

Answer 1

Answer: The frequency of this light is
`6.74* 10^(17)Hz`.

Explanation:-

To calculate the frequency of light, we use the equation:

`\lambda=(c)/(\\u)`

where,

`\lambda` = wavelength of the light =
`430nm=430* 10^(-9)m`
`1nm=10^(-9)m`

c = speed of light =
`2.9* 10^8m/s`

`\\u` = frequency of light = ?

`\\u=(c)/(\lambda)`

`\\u=(2.9* 10^8m/s)/(430* 10^(-9)m)`

`\\u=(2.9* 10^8m/s)/(430* 10^(-9)m)=6.74* 10^(17)s^(-1)=6.74* 10^(17)Hz`

The frequency of this light is
`6.74* 10^(17)Hz`.