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.
World War II began with the Nazi invasion of Poland on September 1, 1939, at 4:40 a.m., local time. The United States was attacked by the Japanese on December 7, 1941. We declared war on Japan the next day, and Germany, being Japan's ally, declared war on the US on December 11, and we declared in kind shortly thereafter.