Momentum of Photon with Energy of 2500000 Ergs: 8.3*10^-10 J*s/m

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Homework Help Overview

The discussion revolves around calculating the momentum of a photon given its energy in ergs. The subject area is related to the principles of momentum in the context of physics, specifically involving photons and energy conversion.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants present a calculation involving the conversion of energy from ergs to joules and the application of the momentum formula p=E/c. There is a question regarding the appropriate units for momentum, specifically whether to express it in J*s/m or Newton seconds.

Discussion Status

Some participants have confirmed the calculations presented, while others are exploring the implications of unit conversions and the accuracy of the terminology used for momentum.

Contextual Notes

There is a focus on the conversion of energy units and the potential ambiguity in the resulting units for momentum. Participants are considering the implications of these units in the context of their calculations.

melissajohn
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Can someone please check over my solution and let me know if its right or wrong? Thank you.

question:calculate the momentum if the energy of photon is 25 x 10^5 erg?

solution:
2500000 Ergs = 0.25 Joules

p=E/c
(0.25 J)/(3*10^8 m/s)= 8.3*10^-10 J*s/m
 
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Hi melissajohn,

melissajohn said:
Can someone please check over my solution and let me know if its right or wrong? Thank you.

question:calculate the momentum if the energy of photon is 25 x 10^5 erg?

solution:
2500000 Ergs = 0.25 Joules

p=E/c
(0.25 J)/(3*10^8 m/s)= 8.3*10^-10 J*s/m

That looks right to me.
 


ok thanks!... I wasn't sure if the answer was

= 8.3*10^-10 J*s/m

or 8.3*10^-10 Newton seconds

because of the units...
 


Newton seconds would probably be a more exact answer, even though it appears to me that that's the same as a Joule * s/m.
 

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