Calculate the frequency in hertz of electromagnetic radiation that has a wavelength of 680.0 nm. (c = 3.00 X 10⁸ m/s)

A laser pointer used in the classroom emits light at 4950 Å, at a power of 4.00 mW. (One watt is the SI unit of power, the measure of energy per unit of time. 1 W = 1 J/s). How many photons are emitted from the pointer in 115 seconds?

Calculate the frequency in hertz of electromagnetic radiation that has a wavelength of 496.nm (c=3.00x10^8 m/s)

2. A laser pointer used in the classroom emits light at 6550 A, at a power of 4.00 mW. (One watt is the SI unit of power, the measure of energy per unit of time. 1 W = 1 J/s). How many photons are emitted from the pointer in 115 seconds?

If a laser emits 5.0 x 1019 photons per second and transfers a total of 80.58 J of energy over 2.06 seconds, what is the wavelength of the emitted light in nm?

What is the wavelength (in nanometers) of electromagnetic radiation that has an energy of 4.71 x10-19 j? Calculate your answer in nm, submitting only the numerical part of it to the nearest whole number.

What frequency of electromagnetic radiation is associated with a wavelength of 100.5 nm? In what region of the spectrum is this frequency?