A fire truck is moving away from a stationary observer at 15 m/s and has a siren frequency of 650 Hz. The speed of sound is 343 m/s. What is the frequency of the fire truck heard by the observer as the truck leaves?

Which of the following is a characteristic shared by both electron and light microscopes? a. they both employ the use of objective lenses. b. both microscopes require an internal camera to visualize the specimen. c. both microscopes have a resolving power of 0.01 nm. d. they both utilize white light to magnify the specimen.