5 兩端開口的管子產生第一諧波(first harmonics)的頻率為f，當一端開口封閉後產生的第一諧波頻率為(A)2f(B)1.5f(C)f(D)0.5f(E)以上皆非

15 When there is a net static charge present on an isolated perfect conductor(A)the charge will be uniformly distributed over the surface of the conductor.(B)the surface charge density will be greatest where the conductor is flat and smallest where there are sharp points.(C)the electric field inside the conductor needs not be zero if the conductor is hollow.(D)every point throughout the entire conductor will be at zero potential.(E)every point throughout the entire conductor will be at a constant potential, but not necessarily at zero potential.

5 兩端開口的管子產生第一諧波(first harmonics)的頻率為f，當一端開口封閉後產生的第一諧波頻率為

(A)2f

(B)1.5f

(C)f

(D)0.5f

(E)以上皆非

相關試題

相關試卷