An atom retains an electron due to: the Coulomb force, the nuclear force, the atomic force, both the Coulomb force and the nuclear force
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Q: An atom with an atomic number of 23 has a mass number of 51. How many protons does it have?
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- Use the following constants if necessary. Coulomb constant, k = 8.987 × 10º N - m² /C&acuum permitivity, €o = 8.854 × 10-12 F/rMagnitude of the Charge of one electron, e = 1.60217662 × 10-19 CMass of one electron, me = 9.10938356 × 10-31 kgUnless specified otherwise, each symbol carries their usual meaning. For example, µC means micro coulomb 93 a a Consider The rectangular arrangement of four point charges shown in Figure 1, where they lie on the corners of the rectangle where q = 19 nC q2 = 43 nCq3 = 27 nCand q4 = -22 nand a = 21 cm a)Calculate how much work is required to set up the arrangement if the charges are initially infinitely far apart and were at rest. (Hint: Use the relation between work done by the external agent and total electrical potential energy of the system) Net workdone Give your answer to at least three significance digits. joules b)Calculate the potential at the centre of the square due to all four charges. Potential at the center Give your answer to at least…Q3: The table shows two isotopes of potassium and two isotopes of calcium. Type of emission Mass of neutral atom / u Number of electrons Number of protons Number of neutrons Total mass/u Mass defect/ u Binding energy / J Mass of the electron = 0.000549 u Mass of the proton = 1.007276 u Mass of the neutron = 1.008665 u TI ***** LEG 39K Stable 38.96371 SE nda 42K ß decay a) Use data about potassium-42 to explain the concept of mass defect. 3000 41.9624 19 19 23 42.34797 0.38557 5.76 x 10-11 De RAP 39 Ca ßt decay 38.9707 440 **** ****** D 42 Ca stable 41.958637636Kr + 0-1e → ? a) it is n (mass # : 1; charge:0) b) no right answer c) it is Br (mass # : 76; protons: 35) d) it is C (mass #: 14; protons 6) e) it is e ( mass #: 0 ; charge +1)
- Station 4 1. A mass spectrometer can be used to identify unknown particles. A particle with a charge of 1.6 x 1019 was injected at a speed of 1.5 x 10° m/s in a circular path of radius 6.5 cm. The spectrometer's magnetic field is perpendicular to the particle path and has a magnitude of 0.25 T. a. Using the table below, what is the identity of the unknown particle? Isotope m (kg) Hydrogen 1.7 x 1027 Deuterium 3.4 x 1027 Tritium 5.0 x 1027Help with these problems4. A negative ion gives up its extra electron is: a) photo ionization b) simple collision ionization c) Electron detachment d) Electron Attachment 5. The electric field E, in a gas bubble immersed in a liquid of permittivity &, is by: 36 a) E,: E. 2€1+€1 %3D 361 b) E, = %3D 2€1+1 2 c) E, = 1.4 %3D RE2 dE d) E, %3D E-2€z dx 6. Formation of a permanent conducting path across a surface of solid insulation called as: a) Tracking b) Flashover c) Oxidation d) Erosion
- 1 E:17 Q.3.jpg Example: which of the following are possible reaction Xe+Sr +2,n 1- 'n+ U →* 2– ¿n+ U →* Sn + Mo +3¿n → I+ Nb+3,n 235 140 94 54 38 1 235 132 101 2- n+U 50 1 239 127 3- n+ Pu 94 41If the electric force between the nucleus and the outermost electron in 6Li is F, what is the electric force between the nucleus and the outermost electron in 7Li, given that the mass of a neutron is approximately 1/9th the mass of 6Li? A) F/9 B) F/3 C) F D) 9F