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Related Concept Videos

Light as Energy01:35

Light as Energy

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The energy required to carry out photosynthesis is light— typically electromagnetic radiation from the sun. The range of all possible wavelengths is known as the electromagnetic spectrum.
Photons
A photon is a discrete electromagnetic particle or bundle of energy. Photons are characterized by their frequency, wavelength, and amplitude, similar to the properties of a wave. Waves with higher frequencies transmit more energy and have shorter wavelengths than longer wavelengths that transmit...
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In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.
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At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
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When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
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Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...
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The concept of the looking-glass self describes how an individual's self-concept is shaped by their perception of how others see them. This psychological theory, first introduced by sociologist Charles Horton Cooley in 1902, posits that self-identity emerges in a social context and is influenced by the judgments—real or imagined—of others.Research suggests that individuals frequently overestimate how positively others perceive them. This is particularly evident in physical...
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Related Experiment Video

Updated: Apr 13, 2026

Building a Simple and Versatile Illumination System for Optogenetic Experiments
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Seeing the light.

Amy Lynn Sorrel

    Texas Medicine
    |May 2, 2015
    PubMed
    Summary

    Medical schools should reconsider restricting resident moonlighting. New Accreditation Council for Graduate Medical Education rules require moonlighting hours to count towards the 80-hour work week, prompting concerns about overly strict policies for physicians in training.

    Area of Science:

    • Medical Education
    • Physician Workforce
    • Graduate Medical Education

    Background:

    • The Accreditation Council for Graduate Medical Education (ACGME) now mandates that resident moonlighting hours count towards the 80-hour weekly work limit.
    • This change has raised concerns among medical associations about potential overly restrictive policies on moonlighting by medical schools and residency programs.

    Purpose of the Study:

    • To address concerns regarding potential restrictions on resident moonlighting.
    • To advocate for a reconsideration of broad limitations or prohibitions on moonlighting by medical schools and residency programs.

    Main Methods:

    • A policy was adopted by the Texas Medical Association's (TMA) Council on Medical Education.
    • The policy was developed in response to concerns raised by the TMA's Committee on Physician Distribution and Health Care Access.

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    Main Results:

    • The adopted policy encourages Texas medical schools and residency programs to re-evaluate and potentially ease restrictions on resident moonlighting.
    • The policy will be presented to the TMA House of Delegates for consideration.

    Conclusions:

    • Overly restrictive moonlighting policies may negatively impact resident training and physician workforce development.
    • Revisiting limitations on resident moonlighting is recommended to support educational and professional growth.