AP BIOLOGY

PHOTOSYNTHESIS

LIGHT DEPENDENT REACTIONS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What does an electron being “excited” mean?
A
It has been released from a water molecule
B
It has lost energy.
C
It has gained energy.
D
It has been accepted by an electron carrier.
Explanation: 

Detailed explanation-1: -When an electron temporarily occupies an energy state greater than its ground state, it is in an excited state. An electron can become excited if it is given extra energy, such as if it absorbs a photon, or packet of light, or collides with a nearby atom or particle.

Detailed explanation-2: -An atom changes from a ground state to an excited state by taking on energy from its surroundings in a process called absorption. The electron absorbs the energy and jumps to a higher energy level. In the reverse process, emission, the electron returns to the ground state by releasing the extra energy it absorbed.

Detailed explanation-3: -It proceeds to a higher energy level called the excited state when the electron gains energy. The electron will be termed as excited electron.

Detailed explanation-4: -The electron stays in an excited state for a short time. When the electron transits from an excited state to its lower energy state, it will gice off the same amound of energy needed to raise to that level. This emitted energy is a photon. The energy of the photon will determine the color of the Hydrogen Spectra seen.

Detailed explanation-5: -The electron can gain the energy it needs by absorbing light. If the electron jumps from the second energy level down to the first energy level, it must give off some energy by emitting light. The atom absorbs or emits light in discrete packets called photons, and each photon has a definite energy.

There is 1 question to complete.