speed of sound in dry air at 20 °C is___________?
A. 353 m/s B. 345 m/s C. 343 m/s D. none of them
A. 353 m/s B. 345 m/s C. 343 m/s D. none of them
A. Acceleration B. Displacement C. Speed D. Force
A. Waves B. Particles C. Energy packets D. Electromagnetic
A. 22 feet B. 32 feet C. 52 feet D. 42 feet
A. Refraction B. Light scattering C. Reflection D. Interference
A. Sound can’t travel through vacuum B. Sound can’t travel through glass C. Sound can’t travel through water D. Non of theses
A. translational B. rotational C. vibrational D. all of these
A. Constant B. Slowest C. Fastest D. None of these
A. 1/5th of the unit B. 1/100 of the unit C. 1/10th of the unit D. 1/1000th of the unit