Nuclear chemistry Questions and Answers

1 50 sec 2 90 sec 3 60 sec 4 48 sec HT0107 00 If denotes the wavelength at which the radiation emission from a black body at a temperature T Kis maximum then 1 a T a T 3 2 4 a T a T

fe and a be the emissive power and absorption Dower respectively of a body and E be the emissive power of an ideal black body then from Kirchhoff s aws 1 a E e 2 a e E

HT0083 77 According to Newton s law of cooling the rate of cooling of a body is proportional to 1 Temperature of the body 2 Temperature of the surrounding 3 Fourth power of the temperature of body 4 Difference of the temperature of the body and the surrounding 8

26 A solid material is supplied with heat at a constant rate The temperature of material is changing with heat input as shown in the figure What does slope DE represent Temperature A B C D O 1 latent heat of liquid 2 latent heat of vapour Heat Input E 3 heat capacity of vapour 4 inverse of heat capacity of vapour HT0028

KN0023 starting s The 36 m KN0024 me t as e particle KN0030 31 A particle located at x 0 at time t 0 starts moving along the positivex direction with a velocity V which varies as v a x then velocity of particle varies with time as a is a constant 1 v t 2 v x 1 3 v t 4 v constant KN0031

3 66 7 m s 4 33 3 m s KN0020 21 A point object traverses half the distance with velocity v The remaining part of the distance is covered with velocity v for the half time and with velocity v for the rest half The average velocity of the object for the whole journey is 20 1 2v v v v 2v 2v 2 2v v v v V V 3 2v v v v v 2v 4 2v v v v 2v v

Pre Medical Physics 77 s 28 A block of ice with mass m falls into a lake After impact a mass of ice m 5 melts Both the block of ice and the lake have a temperature of 0 C If L represents the heat of fusion the minimum distance the ice fell before striking the surface is 1 1 2 2 5L g

FL0057 Application of Bemoulli s theorem can be seen in 1 Dynamic lift to aeroplane 2 Hydraulic press 3 Speed Boat 4 None of these

Consider two nuclei one of 70 Ge and other of 198 correct statement s from the following ONO The nuclei radius of 70 Ge and 198 Au are same The nuclei volume of 70 Ge and 198 Au are same Au and choose the The nuclear densities of both 70Ge and 198 Au are same

EXERCISE I Conceptual Questions REFLECTION OF LIGHT AT PLANE SURFACE When a ray of light is incident normally on a plane mirror then the angle of reflection will be 1 0 2 90 3 180 4 90 1

Hydrogen atoms in a particular excited state n when all returned to ground state 6 different photor emitted Which of the following is are incorrect A Out of 6 different photons only 2 photons have wavelength equal to that of visible light B If highest energy photon emitted from the above sample is incedent on the metal plate having work 8 eV AKE of liberated photo electron may be equal to or less than 4 75 eV C Total number of radial nodes in all the orbitals of nth shell is 24 D Total number of angular nodes in all the orbitals in n 1 th shell is 23

In a hydrogen like sample electron is in 2nd excited state the Binding energy of 4th state of this sample is 13 6 then A A 25 eV photon can set free the electron from the second excited state of this sample B 3 different types of photon will be observed if electrons make transition up to ground state from the sec excited state C If 23 eV photon is used then K E of the ejected electron is 1 eV D 2nd line of Balmer series of this sample has same energy value as 1st excitation energy of H atoms

There are two naturally occurring isotopes of chlorine Cl and Cl Use the atomic mass of thallium listed on the periodic table to identify the mom isotope Match the words in the left column to the appropriate blanks in the sentences on the right 4 farther from 17 37 C closer to Isotope is more abundant because its mass number the mass number of chlorine which is 35 45 amu W Reset Help

4 80 cal K B Carnot cycle is plotted in P V graph Which portion represents an isothermal expansion PIA 1 AB 2 BC 3 CD

A meteor has a Pb 206 U 238 mass ratio of 0 850 1 00 Fallm What is the age of the meteor Assume that the meteor did not contain any Pb 206 at the time of its formation Express your answer using two significant figures VO

The natural radioisotope radium 226 226Rn undergoes a radioactive decay where it emits an alpha particle to become radon 222 222Rn which has a half life of 3 82 days Will a sample of 222Rn be at less than one fifth 1 5 of its original strength after a period of 5 days Explain 5 marks

3 4 4 1 If threshold wavelength 2 for ejection of electron from metal is 330 nm then work function for the photoelectric emission is 1 6 10 10 J 3 3 10 19 J 2 1 2 x 10 18 J 4 6 10 19 J

The bond lengths and bond angles of formaldehyde are given in the figure 7 121 9 H 1 205 116 133 1 111 H Fig 7 Bond lengths in angstrom and bond angles in degree of H CO H CO can be approximated as a symmetric top Calculated the transition frequency of J 4 K 1 J 3 K 1 in Hz Make necessary assumptions for the calculation

MISSED THIS Watch KCV 2 4 Read Section 2 4 You can click on the Review link to access the section in your e Text Part A What is the de Broglie wavelength of an electron traveling at 1 54 x 105 m s Express your answer to three significant figures and include the appropriate units View Available Hint s HA Value Units

A certain first order reaction is 48 complete in 45 s What are the values of the rate constant and the half life for this process S 1 k t1 2 S

What are the differences between Nuclear Fission and Fusion

Complete the missing information in the reactions Then label the reaction one of the following 238 U 92 15 8 O 32 15 P 244 94 Electron Capture Positron Emission Pu 105 Ag 47 Alpha Decay Beta Decay 15 14 N 7 7 234 Th 90 0 1 4 N 2 e He 1 0 40 20 e 0 e 1 105 46 Ca Pd Type Type Type Type Type Type Type

The following all undergo electron capture Write the complete nuclear equation 106 47 116 50 190 78 53 123 Ag 61 29 Sn 30 116 50 16 Pt I The following all undergo positron emission Write the complete nuclear equation Sn Cu S

An isotope with a half life of 18 0 seconds was produced in a physics lab as a by product of a reaction Exactly how many half lives pass after 126 seconds have elapsed Enter only a number

On your own paper write the equation for the nuclear reaction described in each of the following processes 1 The transmutation that occurs when a scandium 48 nucleus undergoes beta decay 2 Americium 241 undergoes alpha decay inside a smoke detector 3 Technetium 99 99mTc undergoes gamma decay to form 99Tc Upload your equations Posted Today at 9 13 am Comments

Enter the expression 4N a where a is the lowercase Greek letter alpha Express your answer as a chemical expression A O B Y V

Identify the resultant isotope when Bismuth 216 undergoes 2 alpha decays 3 beta decays and 1 electron capture Report the element name chemical symbol is acceptable and the isotope mass in the blanks below Isotope element name Isotope element mass Blank 1 Blank 2

26 The isotope cobalt 57 has a half life of 272 d How long will it take a sample of 57Co to decay to 38 of its original activity A 103 d B 337 d C 188 d D 380 d

24 Which of the following represents a fission reaction A Hydrogen 2 and helium 3 combining to form a helium 5 atom and a neutron B Carbon 14 and helium 3 combining to form a sodium 13 atom and a proton C Polonium 215 absorbing a proton to form polonium 218 D Uranium 235 absorbing a neutron and breaking into barium 141 krypton 92 and three neutrons

3 lodine 131 is used to detect and treat thyroid disorders a If someone was injected with lodine 131 how long would it take for the sample to decay to 1 16 of the original dose b Write the decay equation showing what type of radiation is emitted and what the decay product would be c Would we expect the decay product from part b to be very reactive or not Why

4 Strontium 90 is an especially harmful byproduct of nuclear fission because the body treats it as though it were calcium How long is Sr 90 s half life if 1 16 of a sample remains

Find the half ife of a radioactive substance that decays by 2 in 5 years Round your answer to one decimal place

28 Identify the missing particle in the following reaction 212 83 A 23Bi 79 Au 212 204 299 Au 79 204 Zr B C D 29 Identify the missing particle in the following reaction 97 Zr A 96 B Zr c He 38 Sr D He 28 Ti A Be B He c H D B in 235U 2n 32Te 30 Identify the missing particle in the following reaction Li ne He

27 The nuclear process that takes place in an atomic bomb or in a nuclear reactor in a more controlled fashion is illustrated in the highly simplified diagram shown below In reality the splitting of U235 into the same parts each time is not realistic A B C 11 D U 235 Ba 141 Kr 92 In the diagram above energy is released when each uranium nucleus is split Which statement is true n The mass of the uranium is equal to the mass of Ba141 Kr92 and 2 neutrons The mass of the uranium is less than the mass of Ba141 Kr92 and 2 neutrons The mass of the uranium is more than the mass of Ba141 Kr92 and 2 neutrons The mass of the uranium is equal to the mass of Ba141 Kr92 and 3 neutrons

1 An aircraft company is receiving complaints that passengers in their planes are receiving high levels of radiation from the Sun and other background radiation sources They respond by posting the following response online Airline company All of our aircraft are designed with state of the art aluminum sheeting that blocks all radiation types from all sources Thus our passengers are not exposed to any dangerous levels of radiation inside of our aircraft The Sun and other background sources produce alpha beta and gamma radiation all of which enter Earth s atmosphere Based on all of the information what statement best evaluates the airline company s claims A B C D The airline company has made a correct claim about their aircraft and radiation The aluminum sheeting will not be able to block any type of radiation The aluminum sheeting will not block the high energy gamma radiation Aluminum could block the weak background radiation but not the Sun s radiation

22 Ernest Rutherford used alpha particles in his research which resulted in the discovery of th nucleus Which of the following reactions releases alpha particles that could be potentiall used for this kind of particle research A B C 226 Ra 88 14 4C 4 N 222 Rn 86 6 18 8F 9 1 18 80

one ene 29 Identify the element in the reaction that is missing and then identify the type of reaction as alpha be or gamma 1942K 10e 00Y Gramme Jeany

500ms 25 From the time constant for C 14 determine the half life for beta decay of C 14 in clicks 26 Convert the half life of C 14 to years Hint use your measured value of the total time C 14 Click 0 1 2 3 4 5 56 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 Table 2 Beta Decay C 14 88 79 75 64 59 SI 48 43 39 36 32 27 21 19 M 100 as 15 n 13 9 8 years N 14 0 4 11 20 24 40 48 61 56 60 63 67 72 78 80 35 82 84 86 88 90 91

Write the first four steps in the radioactive decay series of Bismuth 215 AN 83 Alpha and Beta go in the Yellow box for it to be graded correctly 1 Alpha 2 Beta

Balance the following nuclear reaction Sodium 23 AN 11 decomposed to form magnesium 23 AN 12

A certain radioactive substance has a half life of five days How long will it take for an amount A to disintegrate until only one percent of A remains

4 A particular nuclide undergoes positron emission Complete parts a b 4 pts a This nuclide is on above below the belt of stability circle one of the words in italics b Which of the following is true concerning this nuclide circle your answer n p is too high n p is too low n p is not too high or too low

The energy of an electromagnetic wave doubles What other changes if any occur with the wave during the increase in energy O The speed increases O There are no changes O The frequency increases The wavelength increases

What is the difference between the following two isotopes 12 C 6 13 C 6 Carbon 13 O the number of protons O the number of neutrons O the number of electrons the number of valence electrons Carbon 12

What is the radioactive particle released in the following nuclear equation 155 72 00000 159 74 W alpha particle beta particle gamma ray proton neutron Hf

If a large nucleus with 92 protons splits to form a nucleus with 56 protons and another with 36 protons what type of element is being formed by the nuclear reaction

The element with atomic number 84 undergoes alpha decay followed by beta decay What is the atomic number of the daughter nuclide following these two decays 83 O 81 82 84

29 If the half life of a radio active element is 27 7 years many years will it take for a sample to decay to the is Wall of the original value its activity point where how

23 An archaeological sample contains 0 700 g of lead 206 and 2 144 g of uranium 238 Assume that all the lead now present in the rock came from the radioactive decay of the uranium and that no appreciable amounts of other radioactive nuclides are present in the sample The decay rate constant for the uranium is 1 54 x 10 10 year What is the age of the sample 5 points a 8 41 x 10 years b 9 03 x 10 years c 2 08 x 10 years d 6 33 x 10 years e None of these are correct

19 Describe one benefit and one drawback to using our current form of nuclear energy as a power source 2 pts Your answer 20 Describe a useful application of nuclear radiation and explain how it is important in everyday life 2 pts