# Question

If an electron has a kinetic energy of 2 keV, could the classical expression for kinetic energy be used to compute its speed accurately? What if its kinetic energy is 2 MeV? Explain.

## Answer to relevant Questions

If a proton has a kinetic energy of 2 MeV, could the classical expression for kinetic energy be used to compute its speed accurately? What if its kinetic energy is 2000 MeV? Explain. At an astronomical meeting, it is reported two galaxies had been detected, approaching each other with speeds of 0.700c and 0.600c (relative to the Earth), respectively. As a cub reporter, you are tempted to rush out and ...A person 1.20 km away from you fires a gun. A wind is blowing at 10.0 m/s. How much different from the “no wind” time of travel is there for the sound to reach you compared to the situation when the wind is blowing (a) ...A pole vaulter at the Relativistic Olympics sprints past you to do a vault at a speed of 0.65c. When he is at rest, his pole is 7.0 m long. (a) What length do you perceive the pole to be as he passes you, assuming his ...An average home uses about 1.5 x 104 kWh of electricity per year. How much matter would have to be converted to energy (assuming 33% efficiency) to supply energy for 1 year to a city with 250 000 such homes? (Are you ...Post your question

0