A laser used to weld detached retinas emits light with a wavelength of 652 nm in pulses that are 20.0ms in duration. The average power during each pulse is 0.6 W. then,

A laser used to weld detached retains emits light with a wavelength 652 nm in pulses that are of 20ms duration. The average power during each pulse is 0.6W. The energy in each pulse and in a single photon are

A pulsed laser emits light at a wavelength of 694.4 nm. The pulse duration is 12 ps, and the energy per pulse is 0.150 J. (a) What is the length of the pulse? (b) How many photons are emitted in each pulse?

A helium-neon laser emits light of wavelength 632.8nm. Calculate the energy of each photon in electron volt.

A cylindrical rod of some laser material 5xx10^-2 m long and 10^-2m in diameter contains 2xx10^25 ions per m^3 . If on excitation all the ions are in the upper energy level and de-excite simultaneously emitting photons in the same direction , calculate the maximum energy contained in a polse of radiation of wavlength 6.6xx10^-7 m. If the pulse lasts for 10^-7s , calculate the average power of the laser during the pulse.

A cylindrical rod of some laser material 5xx10^-2 m long and 10^-2m in diameter contains 2xx10^25 ions per m^3 . If on excitation all the ions are in the upper energy level and de-excite simultaneously emitting photons in the same direction , calculate the maximum energy contained in a polse of radiation of wavlength 6.6xx10^-7 m. If the pulse lasts for 10^-7s , calculate the average power of the laser during the pulse.