Planck's constant: the constant relating the change in energy for a system to the frequency of the electromagnatic radiation absorbed or emitted, equal to 6.626 X 10^-34 J 5. Quantization: the concept that energy can occur only in discrete units called quanta 6. Photon: a quantum of electromagnetic radiation 7. Photoelectric effect: ejection of electrons from a substance by incident electromagnetic radiation, especially by visible light 8. E=mc^2: Einstein's equation proposing that energy has mass; E is energy, m is mass, and c is the speed of light 9.
Increase B. Decreases C. Remains the same D. Becomes zero Answer: A Explanation: Increase in the ionic character is accompanied by an increase in the rate of reaction. 637. Charged bodies when brought close exert force on each other. This force is dependent upon the distance between the charged particles and the value of charge on the particles. If the distance between the 2 charged bodies is halved, the force between them becomes: A.
| | | The energy of a single photoelectron depends only on the frequency of the incident light. | | | The energy of a photoelectron is equal to the sum of the photon energy and the energy needed to remove the electron from the metal. | | | A higher intensity of the incident light means a higher number of emitted photons. | 1 points Question 7 1. In an unexcited atom, the electrons occupy Answer | | the levels with lowest energies.
The electrons experience a magnetic force due to the field that is perpendicular to the velocity vector, so the electrons follow a circular path. By measuring the radius of the circular electron beam, the acceleration voltage and the current supplied, we can determine the charge to mass ratio. The value obtained was 1.00E11C/kg, which has a 30.65% percent deviation from the theoretical value. Introduction Velocity Vector Velocity Vector r r Electron Gun Voltage Controller Electron Gun Voltage Controller B B ΔV ΔV -Explanation: An electron is being shot by an electron gun/cathode gun. The electron is accelerating by being repelled by a negative plate and attracted by a positive plate.
DISPERSION FORCE / LONDON FORCE The London dispersion force is the weakest intermolecular force. The London dispersion force is a temporary attractive force that results when the electrons in two adjacent atoms occupy positions that make the atoms form temporary dipoles. This force is sometimes called an induced dipole-induced dipole attraction. London forces are the attractive forces that cause nonpolar substances to condense to liquids and to freeze into solids when the temperature is lowered sufficiently. Because of the constant motion of the electrons, an atom or molecule can develop a temporary (instantaneous) dipole when its electrons are distributed unsymmetrically about the nucleus.
Physics 102 Lab: Bohr’s Theory of the Hydrogen Atom Salome Moon Introduction: In 1913, the Danish physicist Niels Bohr (1885 - 1962) managed to explain the spectrum of atomic hydrogen by an extension of Rutherford's description of the atom. In that model, the negatively charged electrons revolve about the positively charged atomic nucleus because of the attractive electrostatic force according to Coulomb's law. But the electron can be taken not only as a particle, but also as a de Broglie wave (wave of matter) which interferes with itself. The orbit is only stable, if it meets the condition for a standing wave: The circumference must be an integer multiple of the wavelength. The consequence is that only special values of radius and energy are allowed.
|is less than the mass of the reactants | |b. |is greater than the mass of the reactants | |c. |is equal to the mass of the reactants | |d. |has no relationship to the mass of the reactants | ____ 23. Calculate the number of moles of Al[pic]O[pic] that are produced when 0.60 mol of Fe is produced in the following reaction.
The nucleus of the atom is surrounded by another type of particles. These particles are called electrons. Protons charge is usually equal to the neutrons charge and the amount of protons inside the atom usually is equal to the amount of electrons. An Atom may gain or lose an electron when an outside force aggravates the balancing force between the protons and electrons. (Add in about collisions in a wire look at page 131 in physics textbook) What is Resistance?
BETA PARTICLES Beta rays are much lighter energy particles. The beta particle is an energetic electron given off by the nucleus of unstable isotopes to restore an energy balance. They leave the nucleus at a speed of 270,000 kilometers per second. They can be stopped, for instance, by an aluminum sheet a few millimeters thick or by 3 meters of air. The RS-500 can detect most energetic beta particles through the case.
In one common procedure, ionization is affected by a high energy beam of electrons and ion separation is achieved by accelerating and focusing the ions in a beam, which is then bent by an external magnetic field. The ions are then detected electronically and the resulting information is stored and analyzed in a computer. A mass spectrometer operating in this fashion is outlined in the following diagram. According to Dr. E.A.Alison, for large samples such as biomolecules, molecular masses can be measured to within an accuracy of 0.01% of the total molecular mass of the sample. This is sufficient to allow minor mass changes to be detected.