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What is the name of the perceived change in a sound wave's frequency
due to motion between the observer and the source?
diffraction
Doppler effect
reflection
resonance

Achlorine atom has 17 protons and 18 neutrons. what is its mass number? what is its atomic number?

Which of the following situations is impossible? a) an object has velocity directed east and acceleration directed east. b) an object has zero velocity but non-zero acceleration. c) an object has constant non-zero velocity and changing acceleration. d) an object has velocity directed east and acceleration directed west. e) an object has constant non-zero acceleration and changing velocity.

Talia is manufacturing rolls of wire for hanging pictures. she needs a material that is so that it can easily be pulled into wire without breaking.