• Study Resource
  • Explore Categories
    • Arts & Humanities
    • Business
    • Engineering & Technology
    • Foreign Language
    • History
    • Math
    • Science
    • Social Science

    Top subcategories

    • Advanced Math
    • Algebra
    • Basic Math
    • Calculus
    • Geometry
    • Linear Algebra
    • Pre-Algebra
    • Pre-Calculus
    • Statistics And Probability
    • Trigonometry
    • other →

    Top subcategories

    • Astronomy
    • Astrophysics
    • Biology
    • Chemistry
    • Earth Science
    • Environmental Science
    • Health Science
    • Physics
    • other →

    Top subcategories

    • Anthropology
    • Law
    • Political Science
    • Psychology
    • Sociology
    • other →

    Top subcategories

    • Accounting
    • Economics
    • Finance
    • Management
    • other →

    Top subcategories

    • Aerospace Engineering
    • Bioengineering
    • Chemical Engineering
    • Civil Engineering
    • Computer Science
    • Electrical Engineering
    • Industrial Engineering
    • Mechanical Engineering
    • Web Design
    • other →

    Top subcategories

    • Architecture
    • Communications
    • English
    • Gender Studies
    • Music
    • Performing Arts
    • Philosophy
    • Religious Studies
    • Writing
    • other →

    Top subcategories

    • Ancient History
    • European History
    • US History
    • World History
    • other →

    Top subcategories

    • Croatian
    • Czech
    • Finnish
    • Greek
    • Hindi
    • Japanese
    • Korean
    • Persian
    • Swedish
    • Turkish
    • other →
 
Profile Documents Logout
Upload
Forms of Energy
Forms of Energy

Introduction to Atomic Structure
Introduction to Atomic Structure

topic-2.doc
topic-2.doc

... Electrons are in orbit around the nucleus, are involved in chemical reactions. o Orbital: three-dimensional space where an electron will most likely be found 90% of the time o First energy level: one s orbital, holds 2 electrons o Second energy level: one s and three p orbitals, holds 8 electrons Ch ...
docx - Pdx
docx - Pdx

PPT
PPT

... • Light shining on a metal can “knock” electrons out of atoms. • Light must provide energy to overcome Coulomb attraction of electron to nucleus • Light Intensity gives power/area (i.e. Watts/m2) – Recall: Power = Energy/time (i.e. Joules/sec.) light ...
Chapter 9: Nuclear Chemistry
Chapter 9: Nuclear Chemistry

... different _________ numbers (# of _____________ is different).  Named as: Element symbol – Mass Number ...
Ch1 Mod Review.WXP
Ch1 Mod Review.WXP

Solution set for the midterm exam
Solution set for the midterm exam

neet test paper 05 - Sigma Physics Centre
neet test paper 05 - Sigma Physics Centre

Study Guide Matter: Building Blocks of the Universe
Study Guide Matter: Building Blocks of the Universe

pacing guide - Tallapoosa County Schools
pacing guide - Tallapoosa County Schools

... the Doppler effect.  Explaining reasons for differences in speed, frequency, and wavelength of a propagating wave in varying materials  Describing uses of different components of the electromagnetic spectrum, including radio waves, microwaves, infrared radiation, visible light, ultraviolet radiati ...
22.2 Production of Electromagnetic Waves Oscillating charges will
22.2 Production of Electromagnetic Waves Oscillating charges will

... Nature of Electromagnetic Radiation The success of Maxwell’s Equation appeared to be clear proof that light was a wave phenomena, but we will see in Ch 27 that Einstein suggested that light had a dual naturesome experiments show wave properties and others show particle properties. •For wave propert ...
Photosynthesis Stores Energy in Organic Compounds
Photosynthesis Stores Energy in Organic Compounds

Electron - My CCSD
Electron - My CCSD

electron arrangement in atoms
electron arrangement in atoms

Interactions of Charged Particles with Matter (N Harding)
Interactions of Charged Particles with Matter (N Harding)

... RADIOTHERAPY ...
Chapter 22
Chapter 22

Photosynthesis Stores Energy in Organic Compounds
Photosynthesis Stores Energy in Organic Compounds

HNRS 227 Lecture #2 Chapters 2 and 3
HNRS 227 Lecture #2 Chapters 2 and 3

Electricity Notes
Electricity Notes

HNRS 227 Lecture #2 Chapters 2 and 3
HNRS 227 Lecture #2 Chapters 2 and 3

... What was so unusual about Planck’s findings about blackbody radiation? Why was this considered revolutionary?  Planck's findings were revolutionary because they meant that vibrating molecules could only have a fixed amount of energy that could only be multiples of a certain amount called the quant ...
WS on obj. 1-11
WS on obj. 1-11

modern mini test Jan 2011
modern mini test Jan 2011

... a) What is the half-life of the radioisotope? b) How much time is required (from the original 320 g sample) for the mass of the remaining radioisotope to decrease to 5 g? 2. A particle has a de Broglie wavelength of 6.8  1014 m. Calculate the mass of the particle if it is travelling at a speed of ...
Problem set 4
Problem set 4

... 900 Watts in a collimated beam in the x̂ direction. What is the force on the source? h2i 2. How many photons from a 100 MHz beam of FM radio waves must an electron absorb before it has gained an energy of 10 eV? h1i 3. Is the discreteness of the energy in an electromagnetic wave more easily detected ...
Measuring Planck`s Constant with LEDs - beim Quantum Spin
Measuring Planck`s Constant with LEDs - beim Quantum Spin

< 1 ... 171 172 173 174 175 176 177 178 179 ... 208 >

Photoelectric effect

The photoelectric effect is the observation that many metals emit electrons when light shines upon them. Electrons emitted in this manner can be called photoelectrons. The phenomenon is commonly studied in electronic physics, as well as in fields of chemistry, such as quantum chemistry or electrochemistry.According to classical electromagnetic theory, this effect can be attributed to the transfer of energy from the light to an electron in the metal. From this perspective, an alteration in either the amplitude or wavelength of light would induce changes in the rate of emission of electrons from the metal. Furthermore, according to this theory, a sufficiently dim light would be expected to show a lag time between the initial shining of its light and the subsequent emission of an electron. However, the experimental results did not correlate with either of the two predictions made by this theory.Instead, as it turns out, electrons are only dislodged by the photoelectric effect if light reaches or exceeds a threshold frequency, below which no electrons can be emitted from the metal regardless of the amplitude and temporal length of exposure of light. To make sense of the fact that light can eject electrons even if its intensity is low, Albert Einstein proposed that a beam of light is not a wave propagating through space, but rather a collection of discrete wave packets (photons), each with energy hf. This shed light on Max Planck's previous discovery of the Planck relation (E = hf) linking energy (E) and frequency (f) as arising from quantization of energy. The factor h is known as the Planck constant.In 1887, Heinrich Hertz discovered that electrodes illuminated with ultraviolet light create electric sparks more easily. In 1905 Albert Einstein published a paper that explained experimental data from the photoelectric effect as being the result of light energy being carried in discrete quantized packets. This discovery led to the quantum revolution. In 1914, Robert Millikan's experiment confirmed Einstein's law on photoelectric effect. Einstein was awarded the Nobel Prize in 1921 for ""his discovery of the law of the photoelectric effect"", and Millikan was awarded the Nobel Prize in 1923 for ""his work on the elementary charge of electricity and on the photoelectric effect"".The photoelectric effect requires photons with energies from a few electronvolts to over 1 MeV in elements with a high atomic number. Study of the photoelectric effect led to important steps in understanding the quantum nature of light and electrons and influenced the formation of the concept of wave–particle duality. Other phenomena where light affects the movement of electric charges include the photoconductive effect (also known as photoconductivity or photoresistivity), the photovoltaic effect, and the photoelectrochemical effect.
  • studyres.com © 2025
  • DMCA
  • Privacy
  • Terms
  • Report