If you are a lay person and dont understand physics but want to in a fun easy way without math, check this out. Feynman was a wonderful mind and great at explanations:
Ouch! #backgammon can be a cruel game. My opponent (blue), wins by gammon, and gets 4 points having rolled double 5, double 3, double 6!
Life at #dailygammon
NOTE: for those who cant read the below equations (they aren't rendered) you can follow this link to see: http://mathb.in/38381
Here you go a full derivation from the math equations you started with to the one I provided you several times...
axioms (given by you, agreed by physicist):
\[E = {m}_{rel} \cdot {C}^{2}\]
\[{E}^{2} = {p}^{2} \cdot {C}^{2} + {{m}_{rest}}^{2} \cdot {C}^{4}\]
De Broglie's Equation for the momentum of a photon:
\[p = \frac{h}{\lambda}\]
Formula to convert wavelength \(\lambda\) into a frequency:
\[\lambda = \frac{C}{f}\]
Simplify given axioms:
\[{({m}_{rel} \cdot {C}^{2})}^{2} = {p}^{2} \cdot {C}^{2} + {0}^{2} \cdot {C}^{4}\]
\[{{m}_{rel}}^{2} \cdot {C}^{4} = {p}^{2} \cdot {C}^{2}\]
\[{{m}_{rel}}^{2} = \frac{{p}^{2} \cdot {C}^{2}}{{C}^{4}}\]
\[{{m}_{rel}}^{2} = \frac{{p}^{2}}{{C}^{2}}\]
\[{m}_{rel} = \sqrt{\frac{{p}^{2}}{{C}^{2}}}\]
then use de broglie's equation for the momentum...
\[{m}_{rel} = \sqrt{\frac{{(\frac{h}{\lambda})}^{2}}{{C}^{2}}}\]
\[{m}_{rel} = \sqrt{\frac{\frac{{h}^{2}}{{\lambda}^{2}}}{{C}^{2}}}\]
\[{m}_{rel} = \sqrt{\frac{{h}^{2}}{{C}^{2} \cdot {\lambda}^{2}}}\]
Now convert wavelength to frequency...
\[{m}_{rel} = \sqrt{\frac{{h}^{2}}{{C}^{2} \cdot {(\frac{C}{f})}^{2}}}\]
\[{m}_{rel} = \sqrt{\frac{{h}^{2}}{{C}^{2} \cdot \frac{C^2}{f^2}}}\]
\[{m}_{rel} = \sqrt{\frac{{h}^{2}}{\frac{C^4}{f^2}}}\]
\[{m}_{rel} = \sqrt{{h}^{2} \cdot \frac{f^2}{C^4}}\]
\[{m}_{rel} = \sqrt{\frac{{h}^{2} \cdot f^2}{C^4}}\]
and bam you arrive at the equation for the relativistic mass of a photon.
\[{m}_{rel} = \frac{h \cdot f}{c^2} \]
Why cosmology is (probably) not behind the curve | astrobites
https://astrobites.org/2019/11/28/why-cosmology-is-probably-not-behind-the-curve/
A fifth force of nature?
More work is required ...
This Is Why The 'X17' Particle And A New, Fifth Force Probably Don't Exist
https://www.forbes.com/sites/startswithabang/2019/11/26/this-is-why-the-x17-particle-and-a-new-fifth-force-probably-dont-exist/
Is an anomaly in the CMB a statistical fluke or evidence of a curved universe?
What Shape Is the Universe — Closed or Flat? | Quanta Magazine
https://www.quantamagazine.org/what-shape-is-the-universe-closed-or-flat-20191104/
Cosmic Triangles Open a Window to the Origin of Time
https://www.quantamagazine.org/the-origin-of-time-bootstrapped-from-fundamental-symmetries-20191029/
What do simulations tell us about the shape (& mass) of our galaxy?
A new instrument to help understand universe expansion and dark energy - DESI (Dark Energy Spectroscopic Instrument) ...
Our sun is "at least" a third generation star. Interesting article by Ethan Siegel ...
https://www.forbes.com/sites/startswithabang/2019/10/26/ask-ethan-how-many-generations-of-stars-formed-before-our-sun-did/
Irving Finkel is just brilliant! I could listen to him all day ...
Here he is demonstrating the excellent game of '20 squares' - The Royal Game of Ur. Similar to #backgammon
https://www.youtube.com/watch?v=WZskjLq040I