Physics Modern Physics Level: University
AtomThe Boron atom is now ionised by removing several electrons such that it can be described as a hydrogen- like boron ion. State how many electrons it now contains and write down the symbol for this ion.
Physics Modern Physics Level: University
RadioactivityAssume initially that the Boron atom created in the rarioactive decay of 4^11 Be is electrically neutral. How many protons how many neutrons and how many electrons does the Boron atom contain?
Physics Modern Physics Level: University
RadioactivityOne isotope of Beryllium 4^11 Be undergoes beta- minus decay with a half-life of around 14 seconds write an equation for the beta-minus decay of a4^11 Be atom showing the symbols for the Boron isotope that is produced and for the other particles that are emitted.
Physics Modern Physics Level: University
Theory of relativityA rectangular billboard in space has the dimensions 10 meters by 20 meters. How fast and in what direction with respect to the billboard would a spacee traveler have to pass for the billboard to appear square?
Physics Modern Physics Level: University
Theory of relativityHow long would a meter stick appear if it were travelling like a properly thrown spear at 99.5 persent of the speed of light?
Physics Modern Physics Level: University
Theory of RelativityDefine a) time dilation b) Mass-Energy equivalence
Physics Modern Physics Level: University
AtomFind the energy for a hydrogen atom in the stationary state n=4.
Physics Modern Physics Level: University
Dual Nature Davission and germer experimentX-rays of wavelength10.0 pm are incident on a target. Find the wavelength of the x-rays scattered at (a) 45.0degree (b) 90.0 degree.
Physics Modern Physics Level: University
Photo electric effectIf the shortest wavelength produced by an x-ray tube is 0.46 nm, what is the voltage applied to the tube?
Physics Modern Physics Level: University
Dual nature Photo electric effectThe minimum energy required to remove an electron from a metal is 2.60 eV.What is the longest wavelength photon that can eject an electron from this metal?
Physics Modern Physics Level: High School
Compare the energy released per kilogram of deuterium for D-T fusion to the energy released per kilogram of 235U for 235U fission.Note: A gram of deuterium contains 3.01 x 1023 atoms.
Physics Modern Physics Level: High School
Atoms
The angular momentum quantum number l=1. What is the degeneracy of the component of the angular momentum about the z-axis?
Physics Modern Physics Level: High School
Atoms
Draw an energy level diagram for a vibrating particle as a function of the zero point energy. Do the same for rotational motion. Be sure to specify the spacing in each of the diagrams.
Physics Modern Physics Level: High School
Atoms
Calculate the energies of the first four rotational levels of HI, R = 160pm, allowing it to rotate in three dimensions about its center of mass. Express the answer in J and KJ per mole.
Physics Modern Physics Level: High School
Radioactivity
How many radioactive atoms are present in a sample that has an activity of 0.5 microCi and a half-life of 10 years ? (1 curie = 3.7 x 1010 decays/ s )a) 9.5 x E22 atoms
b) 8.4 x E12 atoms
