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.
Germany invaded Poland on September 1 and on September 3, 1939 France and Britain declared war on Germany. However, despite the fact that the Allies did not declare war on Japan until December 1941, Japanese aggression included the occupation of Manchuria as early as 1931, and open war with China between 1937 and 1945.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.