When normal shock waves occurring at an angle ____________ 90 degree then they are called as bow shock.
A. less than
B. greater than
C. equal to
D. none
Answer:A
When normal shock waves occurring at an angle ____________ 90 degree then they are called as bow shock.
A. less than B. greater than C. equal to D. none
Explanation: When normal shock waves occurring at an angle less than 90 degree they are called as oblique shock waves.