0
`{:(,”Column A”,,, “Column B”),(A., 1 MHz, ( ), a., 10^(6) Hz),(B., 340 ms^(-1), ( ), b., “Decibel”),(C., “Music”, ( ), c., “Velocity of sound in air at” 20^(@)C),(D., “Loudness of sound”, ( ), d., 50 Hz ” to ” 80″,”000 Hz),(E., “Bats”, ( ), e., “Pleasant sensation of hearing”):}`