Question

A certain source emits radiation of wavelength 525 nm, What is the energy, in j.

Answer 1

`3.7837 * {10}^( - 19) j`

Step-by-step explanation:

`e = (hc)/( \lambda) \\ where \: h \: = plancks \: constant \\ and \: c = speed \: of \: light`

Planck constant value: h =
`6.62606957 * {10}^( - 34) j \: s\:`

speed of light constant: c =
`299,792,458 (m)/( s)`

`hc = 6.62606957 * {10}^( - 34) j \: s\: \: * \\ 299792458 = 1.98645 * {10}^( - 25) j \: m`

Divide the wavelength in nanometers by 10^9 to calculate the value in meters.

`\frac{525}{ {10}^(9) } = 5.25 * {10}^( - 7) m`

`e = (hc)/( \lambda) \\ = \frac{1.98645 * {10}^( - 25) j \: m}{ 5.25 * {10}^( - 7) m}`

`= 3.7837 * {10}^( - 19) j`