• Shuffle
Toggle On
Toggle Off
• Alphabetize
Toggle On
Toggle Off
• Front First
Toggle On
Toggle Off
• Both Sides
Toggle On
Toggle Off
Toggle On
Toggle Off
Front

### How to study your flashcards.

Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key

Up/Down arrow keys: Flip the card between the front and back.down keyup key

H key: Show hint (3rd side).h key

A key: Read text to speech.a key

Play button

Play button

Progress

1/58

Click to flip

### 58 Cards in this Set

• Front
• Back
 What is the electrical charge of a electrons and protons 1.6 x 10^-19 What happens to an electron if there is change in the voltage it will move What is the postive region of an electric circuit anode What is the negative region of an electric circut cathode Are electrons repelled from the cathod and attracted to the anode yes What is the cause of movement of electrons in a complete circuit An y voltage source in a complete circuit will therefore result in a flow of electrons in the circuit. What is current the flow of electrons through a circuit What is electric current measured in amperes What is an atom made up of protons, neutrons and electrons Where are protons and neutrons found nucleus Is an isolated neutron stable no, half life of 11 minutes What is the units of power watt What is the formula for power current x volts Explain what a electron volt is One electron volt (eV) is the kinetic energy gained whe n a single electron is acceler-ated between two plates that differ in potential by 1 V. Before leaving the negatively charged plate, the electron has a potential energy of 1 eV. What is the atomic number Th e atomic number (Z) is the number of protons in the nucleus of an atom and is unique for each element. What is the mass number -Th e mass number (A) is the total number of protons and neutrons in the nucleus. What is the notation of a element in the periodic table Mass number is A Atomic number is Z What is Z in the periodic table anotation Z = protons. How much do protons and neutrons weigh 1.6 x 10 ^− 2 7 kg. (1 amu) What is avogadro number On e gram-mole of a substance contains 6 x 10^23 atoms What is a nucleon a fancy way of saying protons and neutrons According to the bohr model how do electrons surround the nucleus electrons surround the nucleus in shells (e.g., K-shell and L-shell) as shown for tungsten How are the shells containing electrons named Eac h shell is assigned a principal quantum number (n), beginning with one for the K-shell, two for the L-shell, and so on. How many electrons can each K shell contain -Th e number of electrons each shell can contain is 2n^2 for example the K-shell in tungsten (n = 1) has 2 electrons, the L-shell (n = 2) has 8 electrons, the M-shell (n = 3) has 18 electrons, and so on. What determines the chemical properties of a atom Th e number of electrons in the outer shell (valence electrons) determines the chemical properties of the atom What does the bohr model of an atom look like What causes an atom to stay together Atomi c electrons are held in place by the electrostatic pull of the positively charged nucleus. What is electron binding energy Th e work that is required to remove an electron from an atom is called the electron binding energy What causes the electron binding energy to decrease The electron binding energy decreases rapidly with electron distance from the nucleus. What is the binding energy of the inner shell compared to the outer shell Th e binding energy of outer-shell electrons is small and equal to approximately several electron volts. Th e binding energy of inner-shell electrons is large, that is, thousands of electron volts (keV). What happens to the K shell (inner shell) binding energy as the atomic energy increases it increases In order for a energetic particle to knock out an inner shell electron what must occur Energetic particles can knock out inner-shell electrons only if their energy is greater than the electron binding energy. What happens if there is a vacancy in the K shell (if a high energy particle knocked it out) -A vacancy in the K-shell will be filled by an electron from a higher shell. Electrons moving from an outer shell to an inner shell may emit excess energy as ectromagnetic radiation. What is electromagnetic radiation the transport of energy through space Define wavelength, amplitude, frequency and period Wavelength (λ) is the distance between successive crests of waves. -Amplitude is the intensity defined by the height of the wave. -Frequency (f ) is the number of wave oscillations per unit of time expressed in cy-cles per second, or in hertz (Hz). -Th e period is the time required for one wavelength to pass (1/ f ) . What are the units of frequency hertz What is the speed of electromagnetic radiation in a vacuum light 3 x 10^8 What is the speed of an xray in a vacuum the speed of light What is the formula for the speed of an x-ray V= f x wavelength Is radiation a type of electromagnetic radiation yes Can electromagnetic radiation represents a transverse wave, in which the electric and magnetic fields oscillate perpendicular to the direction of the wave motion. yes What does the electomagnetic spectra look like Do radiowaves have short or long wavelength long wavelengths Can a photon be thought of as a particle As a waver or Electromagnetic radiation can be considered quantized, meaning that it exists in discrete quantities of energy called photons Can a photon act as a wave or a particle yes What is photon energy directly proportional too frequency If the frequency is high will a photon have more energy yes What is the wavelength of an x ray in the magnetude 10^-10meters What is the formula for a photons energy Photon energy is E = h x f = h x ( c/ λ ) = 12.4/λ, where E is in keV, h is Planck's constant, and λ is the wavelength in angstroms. Energy of a photon can be written as E = h x f = h x ( c/ λ ) = 12.4/λ, yes What is the units of the energy of a photon keV What are 2 names of photon B y convention, photons are called x-rays if produced by electron interactions, and gamma rays if produced in nuclear processes. What is a photon called if it is produced by electron interaction x-ray What is a photon called if it is produced by a nuclear process gamma ray What happens to the X-ray beam intensity as it moves away from the tube it decreases bc of divergence of the X-ray beam How do you determine how much the X-ray beam has decreased as it moves away from the tube Th e decrease in intensity is proportional to the square of the distance from the source and is an expression of energy conservation. How much does the X-ray beam intensity decrease at 2 meters compared to 10meters Fo r example, doubling the distance from the x-ray source decreases the x-ray beam intensity by a factor of 4; increasing the distance by a factor of 10 decreases the beam intensity by a factor of 100. What is electric current Electric current is the rate of charge flow past a given point in an electric circuit, measured in Coulombs/second which is named Amperes