2-way radios take sound waves and convert them into electrical signals. Then, they are converted into radio waves to transmit them to the receiving radio where it is converted back into sound waves. Your principal is using a walkie-talkie (2-way radio) to communicate with your bus driver. What are the wave conversions that occurred from the first radio transmitting the person's voice to a second radio? a. From Longitudinal Waves to Electromagnetic Waves to Longitudinal Waves
b. From Sound Waves to Electromagnetic Waves to Transverse Waves
c. From Transverse Waves to Mechanical Waves to Longitudinal Waves
d. From Electromagnetic Waves to Longitudinal Waves to Transverse Waves

i believe that it is a exoplanet

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.