How to calculate the visual magnitude of a star having only the flux of such star?
The equation involves 2 magnitudes and 2 fluxes, corresponding to 2 objects a and b:
ma-mb= -2.5log10\left( \frac{F_a}{F_b}\right)
but I just have Fa and I have to obtain ma.
Is it valid to take...
Thanks, I have the value of class. e- radius, r_e= 2.818e-15, rather I need right values for radii of proton and alpha particles, because those I found are... odd:
r_p=2.1e-16
r_α=2.1e-15
How can be possible r_p<r_e?!
Another founded value for r_p is 8.6e-16, and r_alpha =4r_p...
I've tried to...
Wait... How to obtain m_p from r_p (or viceversa) if don't know density?
I found already values for r_p and r_α, ~10^-16,-15 m, but I would like how to deduce them. Substitute p & α parameters into expression for r_e gives me radius ~10^-37!
Hello! I'm solving problems which come with their answers... but I get different results! Can you help me, please?
The problem statement and equations are in the attached images.
Homework Statement
(Image)
Also:
U=energy in Joules
β=v/c≈1 (relativ. particles)
μ0=4π×10-7
Homework Equations...
It is good idea to write a list with my activities and dues.
Organization, prioritizing & estimate times... Yes... I have trouble with that, though I'm trying to get organized.
Almost always I underestimate how long it will take me to do things, time flies! :frown:
Yes, I do so (both)...
But it's supposed that the webpage gives the best date for observing! ¬¬
I have changed date, haha.
And also, what objects' spectra could I obtain if weather conditions aren't good? Not M87, I guess...
What is the meaning of "Mdist." and "Mill." at http://catserver.ing.iac.es/staralt/index.php webpage?
And "The Nickel Telescope is available to the University of California astronomical community by subscription" --> isn't it available to any astronomer?