The element hydrogen has three naturally occurring isotopes. Which of the following describes the relationship of these isotopes? *
different mass, different atomic number
O same mass, different atomic number
O different mass, same atomic number
O same mass, same atomic number

Phase changes are chemical changes. true or false

Akg a of 55 m at an of 11 ? . if is at 98 km/h, be ?

Waves are used in many practical applications to support work, entertainment, and health. one example is the use of ultrasound imaging to safely track the development of a growing fetus. what is a specific example of a practical application of waves in medicine, entertainment, safety, or other fields? provide a brief explanation of how the properties of waves are useful to that application.