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.
When did the US enter World War 2? December 8, 1941 was the date of the US declaration of war, but in  fact the US was at war on December 7, 1941 at about 7:55 AM when  the Japanese attacked Pearl Harbor, Haw â¦ aii.   This war, while not unexpected, was not the war the US wanted to be  in because it was felt that Germany was the greater threat.   When Germany DECLARED WAR on the US on 11 December 1941.     The first US troops to enter combat in Europe was during the landings on North Africa on 8 Nov â¦ 1942.