(A) 18m/s

(B) 25 m/s

(C) 30 m/s

(D)  36 m/s

(A) light waves

(B) radio waves

(C)  sound waves

(D) all of them

(A) is also doubled

(B) becomes half

(C) becomes 1/4th

(D) becomes 4 times 

(A) vacuum

(B) water

(C)  glass

(D) hydrogen gas

(A) momentum

(B) potential energy

(C) velocity

(D) kinetic energy

(A) degree

(B) radian

(C) steradian

(D) radian second

(A) weak vocal chords

(B) lower frequency

(C) higher frequency

(D) higher amplitude

(A) Radio Detecting and Ranging

(B)Region Device and Ranging

(C) Radio Detect and Rangs

(D) Radio Device and Ranging

(A) a wave reflects upon itself

(B) the amplitude of a wave exceeds its wavelength

(C) two waves overlap

(D) the speed of the wave is zero or near zero

(A)  frequency

(B) intensity

(C) number of overtones

(D)none of these