Electrons are modeled using a “cloud”around the nucleus because they a)can not be precisely located b)travel at the speed of light c)exists in many places at once d)move in an orbit about the nucleus

Option (D) is the correct answer.

Explanation:

An atom consists of three subatomic particles, that is, protons, neutrons and electrons.

Protons and neutrons reside inside the nucleus of an atom whereas electrons revolve around the nucleus of the atom.

According to Bohr, mass of an atom is concentrated inside the nucleus due to the number of protons and neutrons.On the other hand, electrons move in circular motion around the nucleus of an atom.

Hence, we can conclude that electrons are modeled using a “cloud”around the nucleus because they move in an orbit about the nucleus.

sleep paralysis is a parasomnia, events associated with sleep.

sleep paralysis happens when you are in the middle of waking up or falling asleep. it is the feeling of being conscious but unable to move. it definitely involves hallucinations.

i had a friend that had sleep paralysis and he told me a story one time where he was laying in bed and he couldn't move his body no matter how hard he tried and there was someone standing in the corner of his room coming towards him. he couldn't move and you can't "wake up" because you are already conscious. sometimes sleep paralysis can be triggered by frequent waking up during the night based off of multiple trips to the bathroom, or if you had ever been abused, sleep paralysis can start happening from things like that.

frequency or wavelenth of em radiation in a vacuum