Ultrasonic waves have many applications in technology and medicine. one advantage is that large intensities can be used without danger to the ear. what is another advantage of their short wavelength? (why do microscopes use blue light rather than white light to see detail? ) 1. the short wavelengths of ultrasonic waves allow the imaging of smaller objects. 2. it is easy to cook food with ultrasonic waves. 3. ultrasonic waves are good for our health. 4. ultrasonic waves are easy to diffract.

talk back to him about the sport and show him your expertise or leave the room

causes

fossil fuels burn

cities become more industrialized

human population grows worldwide

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me