During world war ii, the effectiveness of german u-boats and underwater mines was ended by the development of select one:
a. acoustic countermeasures.
b. sonar.
c. centimetric radar.
d. both sonar and centimetric radar.
e. all these answers are correct.
select one: a. acoustic countermeasures. b. sonar. c. centimetric radar. d. both sonar and centimetric radar. e. all these answers are correct. A quick google search said centimetric radar was invented in 1935 during the range of WWII. Hope I helped some
