I How to Convert Cgs to SI Units for Flux and Energy Values?

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To convert 10.7 mJy to SI units, it is calculated as 1.07 x 10^(-2) Jy, with 1 Jy defined as 10^(-26) W/(m²·Hz). For the flux value of kappa at 2 cm²/g, the correct conversion to SI units involves converting cm² to m² and g to kg, resulting in 2 x 10^(-7) m²/kg. The conversion for grams should involve dividing by 10^(-3) instead of multiplying, correcting the exponent. Understanding these conversions is crucial for accurate scientific calculations.
SorenaJ
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Hi

I have a value that is 10.7 mJy, that I need to convert to SI units. I thought it would be 1.7*10^(-2)*10^(-26) but that might be wrong?

Then I have a flux value, kappa, of 2 cm^2.g^(-1) that needs to be converted to meters and kilogram. I thought it was 2*10^(-7) m2/kg, but that might be wrong as well. I would get the 10^(-4) from converting from cm2 to m2 and the 10^(-3) from converting from g to kg.

Can anyone help?
 
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In the second part, you have the grams conversion wrong because it has a negative exponent. You should be dividing by 10^(-3), not multiplying by it.

I have no idea what a mJy is, but the 10^(-26) is a truly large factor.
 
SorenaJ said:
Hi

I have a value that is 10.7 mJy, that I need to convert to SI units. I thought it would be 1.7*10^(-2)*10^(-26) but that might be wrong?

10.7 = 1.07 × 10

10.7 m = 10.7 × 10-3 = 1.07 × 10-2

Don't drop those zeroes!

BTW, this is the definition of the Jansky (Jy):

https://en.wikipedia.org/wiki/Jansky

1 Jy = 10-26 W / (m2-Hz)
 
Thank you!
 
So I know that electrons are fundamental, there's no 'material' that makes them up, it's like talking about a colour itself rather than a car or a flower. Now protons and neutrons and quarks and whatever other stuff is there fundamentally, I want someone to kind of teach me these, I have a lot of questions that books might not give the answer in the way I understand. Thanks
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