Ahelium-neon laser emits light of wavelength 632.8 nm and has a power output of 16 mw. how many photons are emitted per second by this laser?

The power of the laser is

by using the relationship between power, energy and time, we can find the energy delivered by the laser in 1 second:


The frequency of the photons of this light is given by

and the energy of a single photon is


In order to find the number of photons emitted per second, we must divide the total energy emitted by the laser by the energy of a single photon, and we get:

The horse latitudes-high-pressure zones about 30 degrees north and 30 degrees south of the equator.-warm air traveling away from the equator cools and sinks-weather tends to be clear and drythe doldrums-low-pressure near equator-air rises and spreads out toward the poles-rising moist air produces clouds and heavy rainthe westerlies-blow from the west-move from the horse latitudes toward the poles.-bring storms across much of the united statesthe tradewinds-blow from the east-move from the horse latitudes toward the equator  -strong, steady winds

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