The speed of sound in air at sea level is approximately____________?
A. 300 meter per second B. 320 meter per second C. 340 meters per second D. 370 meter per second
A. 300 meter per second B. 320 meter per second C. 340 meters per second D. 370 meter per second
A. 10-8 mm B. 10″6 cm C. 10″10 m D. 10~14 m
A. one watt B. one joule C. five joules D. one joule second
A. 70 kg B. 80 kg C. 90 kg D. 100 kg
A. Thomas Alva Edison B. Newton C. Joule D. Kepler
A. particulate pollutant B. gaseous pollutant C. aerosol D. none of these