In a particle accelerator, you accelerate an electron. Afterwards, you measure it's energy to be 350 keV. Tell my why you can't find the speed from this energy using your knowledge of classical mechanics.
In order to see what the problem is, I will attempt to find this speed. 350keV=5.6110-14 J Ek=1/2 * mv2 => v=sqrt(2Ek/m) By plugging in numbers, we find that the velocity of the electron, v=3.51108. This velocity is bigger then the speed of light c=3108, and it is a known fact that nothing can travel faster than light. This means that relativistic effects must've taken place, which prevented the particle from reaching the speed of light, but allowed it to have such a high energy.
CP
Related Physics A Level answers
All answers ▸The speed of water moving through a turbine is 2.5 m/s. Show that the mass of water passing through an area of 500 metres squared in one second is about 1 x 10^6 kg (density of sea water = 1030 kg/m^3)
This Question is a multi-parter but all around the same scenario. Similar to an end of paper A-level physics question.
Calculate the time taken for 1000L of water at rtp to be heated to 40degrees celsius using a 40kW heater
An object has a mass of 10kg and sits on a slope with an angle of elevation of 45 degrees. work out the reaction force of the object to the slope and the force acting down the slope. (3/4 marks)