Sean, after being so happy for two full days that he reported he "never needed much sleep," now is stating he is so sad that he cannot stop crying. sean has a) major depressive disorder b) generalized anxiety disorder c) obsessive-compulsive disorder d) bipolar disorder

Sean has bipolar disorder.

Explanation:

People who have bipolar disorder have two different opposing moods. The two moods are mania and depression. Mania is an extremely elevated mood, almost like euphoria. It gives a person a feeling like they are superhuman and could conquer the world if they tried. Some people start to believe they can fly, while others go out and spend excessive amounts of money. During a state of mania, a person often is incapable of sleeping or focusing, yet feels happier than ever. This is the state that Sean had described feeling first. The manic stage often lasts for a short period of 1 to 2 days, before the depressive stage takes over. During the depressive stage, the person will feel as if they are at the lowest point in their life, and will often be unable to feel anything but pain, sadness, or anger.

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what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

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