Question

Question #2a44d

Answer 1

All you have to do to solve this problem is to use the equation that establishes a relationship between energy and wavelength

`E = h * c/(lamda)`, where

`lamda` - the wavelength of the photon;
`c` - the speed of light, usually given as `3 * 10^(8)"m/s"`;
`h` - Planck's constant, equal to `6.626 * 10^(-34)"J s"`

Plug the value given to you for the wavelength of the photon and solve for `E`

`E = (6.626 * 10^(-34)"J"cancel("s") * 3 * 10^(8)cancel("m")cancel("s"^(-1)))/(2.21cancel("m")) = color(green)(8.99 * 10^(-26)"J")`