Q&A Hero

Physic

Q: The symbolic notation for an alpha particle is ______________.
Q: The atomic mass of a hypothetical element consisting of 50% 30X and 50% 32X would be about ______________ u.
Q: The collective name for neutrons and protons is ______________.
Q: The central core of the atom is called the ______________.
Q: The diameter of the average nucleus is about ______________ m.
Q: The diameter of the average atom is about ______________ m.
Q: The alpha scattering experiment resulted in the discovery of the ______________.
Q: The symbol for the element whose atoms contain 28 protons is ______________.
Q: A scientist named ______________ discovered the neutron in 1932.
Q: A scientist named ______________ discovered the proton in 1919.
Q: The number of nucleons in an atom of is ______________.
Q: The number of electrons in an atom of is ______________.
Q: The number of protons in an atom of is ______________.
Q: The number of neutrons in an atom of is ______________.
Q: The number of neutrons in a triton is ______________.
Q: The number of neutrons in a deuteron is ______________.
Q: Isotopes of an element differ in their numbers of ______________.
Q: Which type of hydrogen is referred to as "heavy hydrogen"? A) Tritium B) Hydronium C) Protium D) Deuterium
Q: What type of decay changes only the energy of a nucleus and not its identity? A) Positron B) Alpha C) Gamma D) Beta
Q: The symbol notation now used for elements was developed by A) Dalton. B) Berzelius. C) Rutherford. D) Bohr.
Q: What is the symbol for the element Fermium? A) Fm B) La C) Er D) Tc E) He
Q: What is the symbol for the element copper? A) Co B) Ce C) Cr D) Cu
Q: Defects in the subsequent offspring of the recipient of radiation are called ______________ effects. A) genetic B) latent C) somatic D) threshold
Q: Short-term and long-term effects of radiation on the health of the recipient are called ______________ effects. A) threshold B) somatic C) latent D) genetic
Q: In which unit would it be best to state the dosage of radiation absorbed, with regard to its effects on humans? A) Roentgens B) Curies C) Becquerels D) Rems
Q: Which of the following types of radiation has the leastability to penetrate matter? A) Alpha particles B) Gamma rays C) X-rays D) Beta particles
Q: Which of the following types of radiation has the greatest ability to penetrate matter? A) Gamma rays B) Beta particles C) Alpha particles D) Protons
Q: Any nuclear process that leads ______________ on the "mass defect per nucleon versus mass number" curve will release nuclear energy. A) right B) up C) down D) left
Q: Which of the following has notyet been proved practical? A) Fusion reactor B) Fusion bomb C) Fission bomb D) Fission reactor
Q: In nuclear fusion, A) light nuclei combine to form a heavier nucleus. B) a large nucleus splits into two smaller ones. C) an initial reaction triggers a chain reaction. D) protons are converted into neutrons and energy.
Q: Thermonuclear warheads, or hydrogen bombs, are powerful mainly because of the A) fission process. B) fusion process. C) absorption of neutrons by 238U. D) emission of protons by 238U.
Q: An endoergic reaction A) releases energy. B) requires a high temperature. C) occurs only in stars. D) absorbs energy.
Q: An exoergic reaction A) absorbs energy. B) requires a high temperature. C) releases energy. D) occurs only in stars.
Q: The nuclide at the top of the "relative stability of nucleus versus mass number" curve is A) iron-56. B) uranium-235. C) uranium-238. D) helium-4.
Q: Fusion reactors of the future are likely to use ______________ as fuel. A) enriched uranium B) plutonium C) americium D) deuterium
Q: The process of obtaining energy by merging small nuclei is called A) fission. B) fusion. C) nucleogenesis. D) bombardment.
Q: The reaction is an example ofA) fission.B) alpha emission.C) naturally occurring neutron decay.D) fusion.
Q: Who discovered the nucleus of the atom in 1911? A) Thomson B) Rutherford C) Dalton D) Bohr
Q: Who discovered the electron in 1897? A) Dalton B) Bohr C) Rutherford D) Thomson
Q: The ancient Greek who is known for championing the concept of atom was named ______________. A) Democritus B) Socrates C) Plato D) Zeus
Q: If the energy of n= 6 is -0.378 eV and that of n= 4 is -0.850 eV in a hydrogen atom, a transition from n= 6 to n= 4 will emit a photon of what energy?
Q: If the energy of n= 5 is -0.544 eV and that of n= 2 is -3.40 eV in a hydrogen atom, a transition from n= 2 to n= 5 will absorb a photon of what energy?
Q: Calculate the radius in nanometers of the Bohr orbit of a hydrogen atom's electron with n= 6.
Q: Calculate the energy En, in electron volts, of a hydrogen atom's electron with n= 6.
Q: A CD player uses a laser whose light frequency is 3.85 x 1014 Hz. Calculate the energy, in joules, of the photons.
Q: Calculate the de Broglie wavelength of a 0.145-kg baseball moving at a speed of 45.2 m/s.
Q: Calculate the de Broglie wavelength for an electron (m= 1 x 10-30 kg) moving at 2.4 x 106m/s.
Q: Calculate the energy in electron volts of the photon emitted when an electron in a hydrogen atom goes from n= 2 to n= 1.
Q: If the energy of n= 4 is -0.85 eV and that of n= 2 is -3.40 eV in a hydrogen atom, a transition from n= 4 to n= 2 will release a photon of what energy?
Q: Calculate the radius in nanometers of the orbit of a hydrogen atom's electron with n= 5.
Q: Calculate the energy En, in electron volts, of a hydrogen atom's electron with n= 5.
Q: Calculate the frequency, in hertz, of photons of light with energy of 2.00 10-19 J.
Q: Calculate the energy, in joules, of photons of light with frequency 6.00 x 1014Hz.
Q: When an electron is added to an atom, a(n) _______________ ion is formed.
Q: Microwave ovens work mainly by exciting molecules of the substance named ______________.
Q: The "X" in X-ray stands for ______________.
Q: A useful instrument that makes use of the wavelike properties of electrons is the electron ______________.
Q: The principle that states that the exact position and the velocity of an object can never be known simultaneously is called ______________ principle.
Q: In the Bohr model, the higher the value of n, the farther from the nucleus the electron is located. In the quantum model, the higher the value of n, the farther from the nucleus the electron ______________ is located.
Q: The most modern model of the atom is known as the ______________ model.
Q: The term probabilityis associated with the model of the atom proposed by ______________.
Q: The wave function Ymathematically represents the ______________ associated with a particle.
Q: In the quantum model of the atom, the location of the electron is described in terms of ______________.
Q: In the electron cloud model, or quantum model, of the atom, the focus is on the ______________ nature of the electron.
Q: Light from an incandescent wire travels through a cool gas and is then dispersed into a(n) ______________ spectrum.
Q: Light from an incandescent wire disperses into a(n) ______________ spectrum.
Q: An excited gas in a gas-discharge tube emits light that disperses into a(n) ______________ spectrum.
Q: The ancient Greek who is known for championing the concept of the atom was named ______________.
Q: The element named ______________ was detected spectroscopically on the Sun before it was found on Earth.
Q: A beam of light can be thought of as consisting of a stream of particles called ______________.
Q: The energy levels of electrons in atoms are ______________, which means that only certain values of energy are allowed.
Q: The energy of a photon equals ______________ multiplied by the frequency.
Q: The energy of a photon is ______________ proportional to its wavelength.
Q: The frequency and energy of a photon are ______________ proportional.
Q: Doubling the wavelength of a photon would ______________ its energy.
Q: Tripling the frequency of a photon would ______________ its energy.
Q: Both line emission and line ______________ spectra are characteristic for a specific element.
Q: The concept of the dual nature of light indicates that electromagnetic waves sometimes act like ______________.
Q: Another name for quantum mechanics is ______________ mechanics.
Q: In terms of a combination of three other symbols, the wavelength (l) of a moving particle is equal to ______________.
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