Answer:
B
Explanation:
Cuz they are supported once discovered and then widely spread then accepted
Answer:
589.038 m/s
Explanation:
i dont know if did this right tho
A substance that is impenetrable by x-rays is described as being radiopaque.
Radiopaque substances will not allow x-rays and or other forms of radiations to pass through them.
Instead, they absorb or block the rays and when used in radiology, they appear white or light gray on photographic films.
Radiopaque materials are applied in generating ultrasound images and other forms of clinical procedures.
More on radiopaque materials can be found here: brainly.com/question/10583205?referrer=searchResults
It's the number of Protons of that atom..