Exam: TOEFL

Definition: A picture taken through a microscope that shows very small things, like cells or tiny organisms.

Example: The scientist examined the photomicrograph to study the details of the cell structure.

Definition: To take a photograph of an object using a microscope, allowing for detailed images of small subjects.

Example: The scientist used a photomicrograph to capture the intricate details of the cell structure.

Definition: A tiny particle of light that carries energy and has no mass or electric charge.

Example: The scientist explained how a photon can travel through space without losing energy.

Definition: Relating to light particles or the technology that uses them.

Example: The photonic devices are essential for modern communication systems.

Definition: The field that focuses on the study and use of light and its properties, especially in technology and communication.

Example: Researchers in photonics are developing new technologies for faster data transmission.

Definition: A chemical process where a substance loses an electron when exposed to light and oxygen, leading to oxidation.

Example: Photooxidation is an important process in photosynthesis, helping plants convert light energy into chemical energy.

Definition: Relating to a process that involves the chemical reaction of light with a substance, leading to oxidation.

Example: The photooxidative process is essential in understanding how plants convert sunlight into energy.

Definition: A regular cycle of light and darkness that occurs over a specific period, often related to the length of day and night.

Example: Plants use the photoperiod to determine when to flower and grow.

Definition: Relating to the response of organisms to the length of day and night, especially in terms of growth and reproduction.

Example: Many plants are photoperiodic, meaning they flower based on the amount of light they receive each day.

Definition: The time during a day when there is light, typically referring to the light part of a cycle that includes both light and dark periods.

Example: Plants use the photophase to perform photosynthesis during the day.

Definition: A condition where a person has an unusual sensitivity or fear of light, often causing discomfort or pain in bright environments.

Example: People with photophobia may need to wear sunglasses even indoors to avoid discomfort from bright lights.