(A) microwave
(B) optical fiber
(C) radio wave
(D) all are operating at nearly the same propagation speed

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(A) microwave
(B) optical fiber
(C) radio wave
(D) all are operating at nearly the same propagation speed
(A) its velocity never changes
(B) its speed always changes
(C) its direction always changes
(D) its speed may or may not change
(A) air to glass
(B) air to water
(C) water to glass
(D) diamond to glass
(A) Angular momentum
(B) Linear Momentum
(C) Planck’s constant
(D) Energy
(A) band rate
(B) band width
(C) data flow
(D) bit capacity
(A) 210 kN/mm2
(B) 100 kN/mm2
(C) 80 kN/mm2
(D) 10 kN/mm2
(A) 5 min
(B) 8 min
(C) 5 min
(D) 10 min
(A) violet
(B) yellow
(C) red
(D) white
(A) power
(B) electric field
(C) magnetic momentum
(D) avaerage velocity
(A) increase
(B) decrease
(C) remains the same
(D) first, decrease then increase