1 What is the first law of Photodynamics 2 Explain the diffe

1. What is the first law of Photodynamics?

2. Explain the difference between Radiance, Irradiance, Fluence and Joules

3. What is better and why - pulse of continuous current

Solution

1.The First Law of Photochemistry states that light (photons) must be absorbed to have an effect and to initiate a photochemical reaction.

2.Irradiance is defined as the power of electromagnetic radiation incident per unit area on a surface.The irradiance denotes the incident radiant energy on a surface.
Radiance is the power per projected area per solid angle.
Radiant fluence is the radiant energy received by a surface per unit area.The SI unit of radiant fluence is the joule per square metre.The fluence is also defined as the time-integrated flux of some radiation or particle stream.
Joule is unit of energy in International system of units.It is equal to the energy transferred to an object when a force of one newton acts on that object in the direction of its motion through a distance of one metre.

3.The continuous discharge rating in amps is the standard specification for amp limits within the battery industry.It is a determination made by the manufacturer and represents the amp limit a battery can be safely used before it will fail.The pulse or burst discharge rating is not a specification standard within the battery industry.Every manufacturer or vendor seems to have their own definition of what the pulse rating is to them.

A pulse discharge rating is never safe and not within the intended operating parameters of the battery. The pulse rating is a condition in which the battery is on basically a buildup to failure.It is exceeding the sustainable and intended discharge rate of the battery.It is inappropriate for a consumer device to operate in the pulse range of its battery.