Electrons in a hydrogen atom must be in one of the allowed energy levels. If an electron is in the first energy level, it must have exactly -13.6 eV of energy. If it is in the second energy level, it must have -3.4 eV of energy. An electron in a hydrogen atom cannot have -9 eV, -8 eV or any other value in between. Let's say the electron wants to jump from the first energy level, n = 1, to the second energy level n = 2. The second energy level has higher energy than the first, so to move from n = 1 to n = 2, the electron needs to gain energy.
Computed Tomography (CT) Scan of the Head and Face. Guide. A computed tomography (CT) scan uses X-rays to make pictures of the head and face. During the test, you will lie on a table that is attached to the CT scanner, which is a large doughnut-shaped machine.Your head will be positioned inside the scanner. The CT scanner sends X-rays through the head.hy It Is Done. A CT scan of the head is done to: 1  Find the cause of symptoms, such as confusion, paralysis, numbness, vision problems, vertigo, or headaches, that might mean a brain injury, a brain tumor, a ruptured aneurysm, or bleeding inside the head.
A cranial CT scan of the head is a diagnostic tool used to create detailed pictures of the skull, brain, paranasal sinuses, and eye sockets.CT stands for âcomputed tomography,â but is known by a variety of names, including brain scan, head scan, skull scan, paranasal sinus scan, and CAT scan. cranial CT scan of the head is a diagnostic tool used to create detailed pictures of the skull, brain, paranasal sinuses, and eye sockets.