"Cecil Moore" wrote in message
...
Rectifier wrote:
You are applying laws that apply to objects with mass to electromagnetic
radiation, which has no mass.

Photons have zero rest mass. Otherwise, they couldn't travel
at the speed of light. But photons traveling at the speed
of light certainly have mass. Where in the world did you
get such irrational ideas?

Read it again! I didn't say photons have zero mass; I said electromagnetic
radiation (EMR) has no mass. EMR exhibits both wave and particle
properties. When travelling at the speed of light, it exhibits wave
properties.

Rectifier wrote:
Read it again! I didn't say photons have zero mass; I said
electromagnetic radiation (EMR) has no mass. EMR exhibits both wave and
particle properties. When travelling at the speed of light, it exhibits
wave properties.

When traveling at the speed of light, it exhibits particle
properties. It has been about half a century since experiments
proved that light waves are bent by gravity thus proving that
electromagnetic radiation has mass. That idea was postulated
in 1915. Did you get your degree before then? :-)
--
73, Cecil http://www.w5dxp.com

"Cecil Moore" wrote in message
...
Rectifier wrote:
Read it again! I didn't say photons have zero mass; I said
electromagnetic radiation (EMR) has no mass. EMR exhibits both wave and
particle properties. When travelling at the speed of light, it exhibits
wave properties.

When traveling at the speed of light, it exhibits particle
properties. It has been about half a century since experiments
proved that light waves are bent by gravity thus proving that
electromagnetic radiation has mass. That idea was postulated
in 1915. Did you get your degree before then? :-)
--
73, Cecil http://www.w5dxp.com

Photons (the particle nature explanation of EMR) have no mass:

http://www.physchem.co.za/OB12-ele/radiation.htm

Rectifier wrote:
Photons (the particle nature explanation of EMR) have no mass:
http://www.physchem.co.za/OB12-ele/radiation.htm

They should have said "no rest mass" to keep the
uninitiated from getting confused. Any particle that
can apply pressure, possesses momentum and "penetrating
ability" at the least has relativistic mass.

http://math.ucr.edu/home/baez/physic...oton_mass.html

"In special relativity, it turns out that we are still able to
define a particle's momentum p such that it behaves in well-
defined ways that are an extension of the Newtonian case.
Although p and v still point in the same direction, it turns
out that they are no longer proportional; the best we can
do is relate them via the particle's 'relativistic mass'."

"It is almost certainly impossible to do any experiment that
would establish the photon rest mass to be exactly zero."
--
73, Cecil http://www.w5dxp.com

On Sep 17, 2:04*pm, "Rectifier" wrote:
"Cecil Moore" wrote in message

...

Rectifier wrote:
Read it again! *I didn't say photons have zero mass; I said
electromagnetic radiation (EMR) has no mass. *EMR exhibits both wave and
particle properties. *When travelling at the speed of light, it exhibits
wave properties.

When traveling at the speed of light, it exhibits particle
properties. It has been about half a century since experiments
proved that light waves are bent by gravity thus proving that
electromagnetic radiation has mass. That idea was postulated
in 1915. Did you get your degree before then? :-)
--
73, Cecil *http://www.w5dxp.com

Photons (the particle nature explanation of EMR) have no mass:

http://www.physchem.co.za/OB12-ele/radiation.htm

No REST mass.

When traveling at the speed of light, it exhibits particle
properties. It has been about half a century since experiments
proved that light waves are bent by gravity thus proving that
electromagnetic radiation has mass. That idea was postulated
in 1915. Did you get your degree before then? :-)

You say the "idea was postulated in 1915." Since when does a postulate
become proof making something a law?

Rectifier wrote:
You say the "idea was postulated in 1915." Since when does a postulate
become proof making something a law?

It was postulated by Einstein in 1915 and measurements
agreed in 1919. It is said to have been proven a scientific
fact in 1959. I'm just surprised that your university didn't
teach it in the postulate stage, valid measurement stage, or
in the scientific fact stage. :-)
--
73, Cecil http://www.w5dxp.com

Cecil Moore wrote:

When traveling at the speed of light, it exhibits particle
properties.

When does light travel at a speed other than the speed of light?

It has been about half a century since experiments
proved that light waves are bent by gravity thus proving that
electromagnetic radiation has mass. That idea was postulated
in 1915.

And later it was postulated that space is curved by massive objects and
that light simply follows the curves.

The idea of epicycles was first postulated in the 6th century BC.
Therefore, what?

73 ac6xg

Jim Kelley wrote:
Cecil Moore wrote:
Rectifier wrote:
When travelling at the speed of light, it exhibits wave properties.

When traveling at the speed of light, it exhibits particle
properties.

When does light travel at a speed other than the speed of light?

From another of my postings: "If I remember correctly,
a photon cannot travel slower than the speed of light."

The first nine words in my first statement above are
not mine but were copied verbatim from Rectifier's posting
(except for the misspelled word). If there was an implication
that light can travel at less than the speed of light, it
didn't come from me.
--
73, Cecil http://www.w5dxp.com

"Cecil Moore" wrote in message
...
Jim Kelley wrote:
Cecil Moore wrote:
Rectifier wrote:
When travelling at the speed of light, it exhibits wave properties.

When traveling at the speed of light, it exhibits particle
properties.

When does light travel at a speed other than the speed of light?

From another of my postings: "If I remember correctly,
a photon cannot travel slower than the speed of light."

The first nine words in my first statement above are
not mine but were copied verbatim from Rectifier's posting
(except for the misspelled word). If there was an implication
that light can travel at less than the speed of light, it
didn't come from me.
--
73, Cecil http://www.w5dxp.com

Light travels at different speeds in different media, such as water, glass,
etc.