# Shared Flashcard Set

## Details

Chapter 38: The Atom and Quantum Questions
Chapter 38 The Atom and Quantum Questions
29
Physics
01/17/2012

Term
 In Bohr’s planetary model of the atom, electrons _______ the nucleus.
Definition
 orbit
Term
 Einstein’s light quantum is called a __________________.
Definition
 photon
Term
 The energy of a photon is proportional to its ________________.
Definition
 frequency
Term
 What is the symbol for Planck’s Constant?
Definition
 h
Term
 The _________________ __________________ is the ejection of electrons from certain metals that are struck by light, reinforcing the ____________ theory of light.
Definition
 Photoelectric Effect Particle
Term
 Yes or No: Can the frequency of light be so low that the photons have insufficient energy to cause a photoelectric effect?
Definition
 Yes
Term
 ________________, like photons, have detectable wavelengths, can be diffracted, and undergo interference.
Definition
 Electrons
Term
 _____________ _____________ are due to transitions of electrons between energy levels that correspond to different electron orbits.
Definition
 Spectral Lines
Term
 The radius of the atoms making up each element is ____________ to that element.
Definition
 unique
Term
 ____________ _______________ is the study of motion in the micro world.
Definition
 Quantum Mechanics
Term
 Quantum measurements, such as momentum and position of an electron, involve fundamental _______________________.
Definition
 uncertainties
Term
 Name the singular form of quanta.
Definition
 quantum
Term
 What are quanta now called?
Definition
 Photons
Term
 Name some other objects that are “quantized.”
Definition
 Matter – made up of quantities called atoms, Electricity – made up of quantities of electrons.
Term
 Do photons have rest energy?
Definition
 No – they only move at one speed C (speed of light)
Term
 Give me an equation for Planck’s constant and explain the terms.
Definition
 h = E/f E: Kinetic energy of a photon f: frequency of a photon
Term
 Define: photosensitive
Definition
 Sensitive to light
Term
 _________________ light carries more energy than _________ light.
Definition
 Bright dim
Term
 What is the critical factor in the photoelectric effect?
Definition
 Frequency of light ultraviolet good infrared poor
Term
 For what did Einstein receive a Nobel Prize?
Definition
 E=hf proportionality of Energy of light to the frequency of light.
Term
 Question proposed by Louis de Broglie.
Definition
 If waves have particle properties, do particles have wave properties?
Term
 What earned De Broglie a Nobel Prize in Physics?
Definition
 All matter can be viewed as having wave properties.
Term
 Highest or Lowest: Electrons normally occupy the ___________ energy levels available.
Definition
 lowest
Term
 List a way an electron can be boosted to a higher energy level in an atom.
Definition
 1. Gas discharge tubes (neon signs) 2. Electric current – current boosts the electron to a higher level.   When the electron returns to the lower level it emits a photon.
Term
 In de Broglie’s theory each electron’s orbit is described as a ___________ ____________.
Definition
 Standing wave
Term
 In the most modern wave model of the atom, _____________ move in and out, toward and away from, the _________ in a standing wave “cloud.”
Definition
 electrons nucleus
Term
 What is Quantum Mechanics?
Definition
 Mechanics in the micro world
Term
 The entire structure of Quantum Mechanics is based on _____________________.
Definition
 probabilities
Term
 What does “butterfly effect” mean?
Definition
 A small effect one place can amplify into very big effect elsewhere.
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