From: guskz on
http://en.wikipedia.org/wiki/File:Inverse_square_law.svg

A star's observed brightness decreases by the inverse square law above
(1/^r^2); for every r advancement of the light beam, the beam also
expands by r in both width & height, thus reducing it's overall
brightness.

AS WELL the brightness "also" decreases due to the Universe's
Expansion, **BUT** it is INCORRECTLY calculated for this reason:

Taking one instance (one quadrant instance of the inverse square law
above):

As space expands (say by "r") in all directions, then so does the
light beam and thus it's brightness reduces.

You take the same quadrant in the image above and expand it by r both
width & height...but then also by depth....so if a quadrant is say 6
by 6 units:

As Space expands, this quadrant expands by (6+r) by (6+r) at the same
instance (location) and then this same (6+r) by (6+r) also expands by
r in depth (thickness), so it expands by r/2 in depth both forward and
then another r/2 backward.

#1: Therefore the formula for a non-expanding space is Brightness ~ 1/
r^2

#2: *BUT* for an expanding space (Universe) the formula should be the
above "as well as" Brightness ~ (1/r^2)/r thickness.

Using "d" instead of "r" for #2, the formula to measure a stars
brightness in an expanding universe should then be:

Brightness ~ 1/r^2 + 1/d^3
thus
Brightness = Luminosity / (r^2 d^3)

The next post will put in actual numbers to inform of the true rate
that space and our Universe is expanding or shrinking.
From: guskz on
On May 22, 2:02 pm, "gu...(a)hotmail.com" <gu...(a)hotmail.com> wrote:
> http://en.wikipedia.org/wiki/File:Inverse_square_law.svg
>
> A star's observed brightness decreases by the inverse square law above
> (1/^r^2); for every r advancement of the light beam, the beam also
> expands by r in both width & height, thus reducing it's overall
> brightness.
>
> AS WELL the brightness "also" decreases due to the Universe's
> Expansion, **BUT** it is INCORRECTLY calculated for this reason:
>
> Taking one instance (one quadrant instance of the inverse square law
> above):
>
> As space expands (say by "r") in all directions, then so does the
> light beam and thus it's brightness reduces.
>
> You take the same quadrant in the image above and expand it by r both
> width & height...but then also by depth....so if a quadrant is say 6
> by 6 units:
>
> As Space expands, this quadrant expands by (6+r) by (6+r) at the same
> instance (location) and then this same (6+r) by (6+r) also expands by
> r in depth (thickness), so it expands by r/2 in depth both forward and
> then another r/2 backward.
>
> #1: Therefore the formula for a non-expanding space is Brightness ~ 1/
> r^2
>
> #2: *BUT* for an expanding space (Universe) the formula should be the
> above "as well as" Brightness ~ (1/r^2)/r thickness.
>
> Using "d" instead of "r" for #2, the formula to measure a stars
> brightness in an expanding universe should then be:
>
> Brightness ~ 1/r^2 + 1/d^3
> thus
> Brightness = Luminosity / (r^2 d^3)
>
> The next post will put in actual numbers to inform of the true rate
> that space and our Universe is expanding or shrinking.

mistake 1/3+1/4 doesn't = 1/12

The formula instead is:

Brightness= Luminosity/r^2 + Luminosity/d^3.

And so, the present formula used is incorrect which is:

Brightness = Luminosity / (r+d)^2.


From: guskz on
On May 22, 2:13 pm, "gu...(a)hotmail.com" <gu...(a)hotmail.com> wrote:
> On May 22, 2:02 pm, "gu...(a)hotmail.com" <gu...(a)hotmail.com> wrote:
>
>
>
>
>
>
>
> >http://en.wikipedia.org/wiki/File:Inverse_square_law.svg
>
> > A star's observed brightness decreases by the inverse square law above
> > (1/^r^2); for every r advancement of the light beam, the beam also
> > expands by r in both width & height, thus reducing it's overall
> > brightness.
>
> > AS WELL the brightness "also" decreases due to the Universe's
> > Expansion, **BUT** it is INCORRECTLY calculated for this reason:
>
> > Taking one instance (one quadrant instance of the inverse square law
> > above):
>
> > As space expands (say by "r") in all directions, then so does the
> > light beam and thus it's brightness reduces.
>
> > You take the same quadrant in the image above and expand it by r both
> > width & height...but then also by depth....so if a quadrant is say 6
> > by 6 units:
>
> > As Space expands, this quadrant expands by (6+r) by (6+r) at the same
> > instance (location) and then this same (6+r) by (6+r) also expands by
> > r in depth (thickness), so it expands by r/2 in depth both forward and
> > then another r/2 backward.
>
> > #1: Therefore the formula for a non-expanding space is Brightness ~ 1/
> > r^2
>
> > #2: *BUT* for an expanding space (Universe) the formula should be the
> > above "as well as" Brightness ~ (1/r^2)/r thickness.
>
> > Using "d" instead of "r" for #2, the formula to measure a stars
> > brightness in an expanding universe should then be:
>
> > Brightness ~ 1/r^2 + 1/d^3
> > thus
> > Brightness = Luminosity / (r^2 d^3)
>
> > The next post will put in actual numbers to inform of the true rate
> > that space and our Universe is expanding or shrinking.
>
> mistake 1/3+1/4 doesn't = 1/12
>
> The formula instead is:
>
> Brightness= Luminosity/r^2 + Luminosity/d^3.
>
> And so, the present formula used is incorrect which is:
>
> Brightness = Luminosity / (r+d)^2.

mistake 1/3+1/4 doesn't = 1/12

The formula instead is:

Brightness= Luminosity/r^2 + Luminosity/d^3.
From: Sam Wormley on
Inverse-square law
http://en.wikipedia.org/wiki/Inverse-square_law

"In physics, an inverse-square law is any physical law stating that some
physical quantity or strength is inversely proportional to the square of
the distance from the source of that physical quantity".

"The intensity (or illuminance or irradiance) of light or other linear
waves radiating from a point source (energy per unit of area
perpendicular to the source) is inversely proportional to the square of
the distance from the source; so an object (of the same size) twice as
far away, receives only one-quarter the energy (in the same time period)".

"More generally, the irradiance, i.e., the intensity (or power per unit
area in the direction of propagation), of a spherical wavefront varies
inversely with the square of the distance from the source (assuming
there are no losses caused by absorption or scattering)".

"For example, the intensity of radiation from the Sun is 9140 watts per
square meter at the distance of Mercury (0.387AU); but only 1370 watts
per square meter at the distance of Earth (1AU)�a threefold increase in
distance results in a ninefold decrease in intensity of radiation".

No Center
http://www.astro.ucla.edu/~wright/nocenter.html
http://www.astro.ucla.edu/~wright/infpoint.html

Also see Ned Wright's Cosmology Tutorial
http://www.astro.ucla.edu/~wright/cosmolog.htm
http://www.astro.ucla.edu/~wright/cosmology_faq.html
http://www.astro.ucla.edu/~wright/CosmoCalc.html

WMAP: Foundations of the Big Bang theory
http://map.gsfc.nasa.gov/m_uni.html

WMAP: Tests of Big Bang Cosmology
http://map.gsfc.nasa.gov/m_uni/uni_101bbtest.html

From: guskz on
On May 22, 3:59 pm, Sam Wormley <sworml...(a)gmail.com> wrote:
> Inverse-square law
>    http://en.wikipedia.org/wiki/Inverse-square_law
>
> "In physics, an inverse-square law is any physical law stating that some
> physical quantity or strength is inversely proportional to the square of
> the distance from the source of that physical quantity".
>
> "The intensity (or illuminance or irradiance) of light or other linear
> waves radiating from a point source (energy per unit of area
> perpendicular to the source) is inversely proportional to the square of
> the distance from the source; so an object (of the same size) twice as
> far away, receives only one-quarter the energy (in the same time period)"..
>
> "More generally, the irradiance, i.e., the intensity (or power per unit
> area in the direction of propagation), of a spherical wavefront varies
> inversely with the square of the distance from the source (assuming
> there are no losses caused by absorption or scattering)".
>
> "For example, the intensity of radiation from the Sun is 9140 watts per
> square meter at the distance of Mercury (0.387AU); but only 1370 watts
> per square meter at the distance of Earth (1AU)—a threefold increase in
> distance results in a ninefold decrease in intensity of radiation".
>
>    No Center
>      http://www.astro.ucla.edu/~wright/nocenter.html
>      http://www.astro.ucla.edu/~wright/infpoint.html
>
>    Also see Ned Wright's Cosmology Tutorial
>      http://www.astro.ucla.edu/~wright/cosmolog.htm
>      http://www.astro.ucla.edu/~wright/cosmology_faq.html
>      http://www.astro.ucla.edu/~wright/CosmoCalc.html
>
>    WMAP: Foundations of the Big Bang theory
>      http://map.gsfc.nasa.gov/m_uni.html
>
>    WMAP: Tests of Big Bang Cosmology
>      http://map.gsfc.nasa.gov/m_uni/uni_101bbtest.html

Is that how you passed your exams, by posting links to the answers?

#1. Is the intensity of a laser inversely proportional to the distance
from the source? Answer is no. Why no?

#2. If space was to expand at the rate of half a light-year, what
would be the intensity of the star at one light years distance?

Or are we all link and no play?