Exton and Shah measured that distance as 0.12 meters, or 0.12 meters per cycle. Multiplying something measured in âmeters per cycleâ by something in âcycles per secondâ will give a measurement in âmeters per second.â That's the wave's velocityâthe speed of light.
The US declared war on Japan (unanimously in the Senate, and 388 to 1 in the House of Representatives) on 8 December 1941 thus entering WWII. The declaration was in response tâ¦o the bombing of Pearl Harbor on 7 December 1941.
In Europe, the war began with Hitler's attack on  Poland, September 1st, 1939. Britain and France had defense  treaties with Poland regarding a possible German attack, and  declared war on Germany two days later.  The US was drawn into the war late in 1941 after Pearl Harbor.owever, it is officially accepted that World War 2 â¦ started when German troops invaded Poland on 1 September 1939. The United States entered the conflict after the Japanese attack on Pearl Harbour on 7 December 1941.