The question about Johnny and his laser is incomplete and ambiguous.
There are many answers depending on how you interpret the question.
Hence my asking "Who is the observer?"
Wow, must bring out Johnny and his laser more often.
Heater did get the point, I knew who the observer was but did not make that clear.
Obviously Johnny, if he is inside and there is no space dust will not see his laser.
Aiming a laser in space at half C at another spaceship which is traveling at ?C.
Assuming they are moving directly towards each other the light will blue shift.
If the other spaceship is stationary and Johnny is heading directly towards it then the wavelength is half, if the red laser is 650nm then the observer is going to see 325nm ultraviolet.
If Johnny is not going directly towards the observer ie cop on the side of the road.
Will it be exactly 325nm the cop sees? Can he then work out what speed Johnny is going?
Asking clear questions is the point, but then providing full information and reference points is the point.
It also depends on perceptions, I know other peoples perception of what I see as a little bit orange they see as yellow. Is my perception wrong or are they wrong? It's not my fault they have faulty colour perceptions
Our perception of what we want and what we think other people want is based on our own experiences. Everyone sees the world differently.
If a noob or someones asks a question and we choose to reply we have to be careful and don't assume they did not ask the wrong question, know what they are asking or are lazy and have no clue or any other interpretation we choose to assume. Huh!
We cannot see the person asking the question so we miss facial clues and get stuck with using emoji's. But sometimes it's bloody obvious they have no clue or maybe they are stuck in a wheelchair and have to type by moving their eyeballs and hence hate long questions
Be nice people.
That kid could be programming your car in 15 years time and might remember you.
The RPF is providing us nice toys and they are about Education.
If we choose to be here then we are part of that education system.
Too bad we just cannot throw dusters at the people who ask stupid questions
But it does not matter anyway because we don't exist and are mostly empty space affected by quantum fluctuations.
I reserve the right to change my opinions at any time, I might just be wrong.
I'm dancing on Rainbows.
Raspberries are not Apples or Oranges