How can we said that photon does not have a mass?

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how can we sad that photon does not have a mass? in my book they are a piece that there write at the photon influence of gravitation?
 
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aloshi said:
how can we sad that photon does not have a mass? in my book they are a piece that there write at the photon influence of gravitation?

Hi aloshi! :smile:

Mass is energy, energy is mass.

A photon does not have rest-mass, but it does have mass.

A box into which photons are inserted (from outside) weighs more, and exerts more gravity.
 

Thread 'Modeling a graph that shows age in relation to depth of an ice sample'

To solve this, I first used the units to work out that a= m* a/m, i.e. t=z/λ. This would allow you to determine the time duration within an interval section by section and then add this to the previous ones to obtain the age of the respective layer. However, this would require a constant thickness per year for each interval. However, since this is most likely not the case, my next consideration was that the age must be the integral of a 1/λ(z) function, which I cannot model.
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