Physics

Nucleus Solutions

Part C Calculate the nuclear diameter of 238 U. Express your answer to two significant figures and include the appropriate units. MÅ ? xa x₂ b X.10 x Powd Du = 16.113 · 10-15 = m Submit Previous Answers Request Answer X Incorrect; Try Again; 4 attempts remaining

104 Polaris iscep ' Antares 10 Spica 10- Capella Regulus Algol Casto Arcturus Mira Aldebaran Mizar 10 Sirius Pollux Solar luminosities Altair • Procyon o Centauri A Sun 1 Ceti- 10-1 a Centauri B 102 Sirius B 103 Procyon 8 104 105 105 20,000 3000 2000 10,000 5000 Surface temperature (kelvins) Which of the stars above is currently fusing elements heavier than hydrogen at its core? ho a. Sirius B b. the Sun c. Betelgeuse od Altair

Betelgeuse 10° Polaris Antares Cep 103 Spica. Regulus Capella Arcturus Mira Aldebaran 102 Algol Vega Castor Mizar Pollux 10 Sirius Altair • Procyon Solar luminosities 1 ea Centauri A Sun T Ceti- . at Centauri B * 101 102 Sirius B 100 Procyon B 104 105 10% 20,000 3000 2000 10,000 5000 Surface temperature (kelvins) Which of the stars above is not actively fusing elements within its interior? O a. Procyon B O b. Antares OC. Mizar O d. Spica 3:18 PM 4/19/2022 PC w & 2

2. . 244 Pu 141 Pr + 59 94 Fission or fusion 3. 4 He + H Fission or fusion 4. Be + 4 12 C Fission or fusion 5. 238U 92 125Te + + 52 Fission or fusion 39 Ni 6. S6 6 Fe + 26 28 Fission or fusion 7. 262Db Mo + 28Si + Fission or fusion 8. 265HS O + Be + 108 Fission or fusion

Question 18 2.5 pts A transformer has a primary coil with 200 turns and a secondary coil with 50 turns. If the transformer has a power output of 38 watts and a secondary voltage of 10 V, what is the primary current? Round your answer to the nearest 0.1. Do not add units.

Homework: Section 2.5 Enhanced Homework Question 6, 2.5.1-PS Part 1 of 4 > HW Score: 51.5%, 10.3 of 20 points O Points: 0 of 1 Save A chemical substance has a decay rate of 7.3% per day. The rate of change of an amount N of the chemical after t days is given by dN = -0.073N. dt ook a) Let No represent the amount of the substance present at t = 0. Find the exponential function that models the decay. b) Suppose that 400 g of the substance is present at t= 0. How much will remain after 6 days? c) What is the rate of change of the amount of the substance after 6 days? d) After how many days will half of the original 400 g of the substance remain? did not eview) rce Library a) N(t)= cources A ions on Tools Incorre

in the image below, the purple particles are protons and the white particles are neutrons. Which of the following equations matches the balanced reaction shown in the diagram? + 3 A. HH H+ H - - 3 B. fH+ H+ He Nw 1 2 C. He + TH - He 2 3 2 ²H + + D. H ww - Li 3 a A b B O O O Time left for this assessment: C C 37:25 d D

Part A Suppose that the uncertainty of position of an electron is equal to the radius of the n= 1 Bohr orbit for hydrogen. Calculate the simultaneous minimum uncertainty of the corresponding momentum component. Express your answer in kilogram-meters per second to three significant figures. IVO AO ? Ap = kg. m/s

m Determine the form of the temperature dependence of the electrical conductivity ne’T (where t = effective collision time) of a semiconductor in a temperature domain-where the density n of free carriers is constant and the dominant scattering mechanism is Rutherford scattering from a constant and small number of charged impurities.

SPR 22 - College Algebra 40495 MATH 102-02 alina zalivchii 02/27/22 5:55 PM na v h = Homework: HW 7 Question 23, 6.8.3 Part 1 of 4 HW Score: 78%, 19.5 of 25 points Points: 0.5 of 1 Save Strontium-90 is a radioactive material that decays according to the function A(t) = A time t (in years). Assume that a scientist has a sample of 400 grams of strontium-90. -0.0244 e where Ao is the initial amount present and A is the amount present at (a) What is the decay rate of strontium-90? (b) How much strontium-90 is left after 10 years? (c) When will only 100 grams of strontium-90 be left? (d) What is the half-life of strontium-90? (a) The decay rate of strontium-90 is % (Type an integer or a decimal. Include the negative sign for the decay rate.) Incorrect: > ents

Below are models of two atoms where e- represents an electron, an n represents a neutron and a p+ represents a proton. Determine the element on the right. * po p* p* np* pinpin npin p pin nn p* pin nn e e. 2 Atomie number 17 I 16 Hydrogen I DE 3 Li Lithium Be Berylum 13 14 15 15 7 B C N Boron Carbon Nitrogen 11 12 14 Atomic mass 8 O Oxygen 16 9 F Fluorit 19 7

(Score for Question 1: of 7 points) 1. Describe at least three of the transformations from one form of energy to another that occur in changing nuclear energy at a power plant to the energy delivered to your home via an electrical wall outlet. Be sure to specify what form of energy is changed to what other form at each step. Answer:

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