Nucleus Questions and Answers

Which of the following parameters is same fo electron in all hydrogen like atoms and ions i their ground states 1 Radius Speed 3 Energy of atom Speed Energy 4 Speed Radius 2

unstable nucleus of mass M initially M at rest emits an element of mass The Q 50 value of this nuclear reaction is E What will be kinetic energy of emitted element in this process 1 3 E 50 E 2 49E 50 50 4 E

Two identical metal plates show photoelectric effect by a light of wavelength falling on plate A and A on plate B A2 The maximum kinetic energy is 1 2K Kg 2 K KB 2 3 KA 2KB 4 K Kg 2

m In process of nuclear fission of 1 g uranium the mass lost is 0 90 mg The efficiency of power house s fission reactor is 20 To obtain 400 mega watt power from the power house how much uranium required per hour 1 88 g 3 44 g 2 178 g 4 39

1 If the frequency and intensity of light source are both doubled then the saturation photocurrent remains the same 2 A non monochromatic light is used in an experiment on photoelectric effect the stopping potential is related to the longest wavelength 3 When stopping potential is applied to a photoelectric experiment no photocurrent is observed because the emission of photoelectrons is stopped 4 The product of force and time has the same unit as that of Planck s constant

A hydrogen sample is prepared in a particular excited state A Photons of energy 2 55 eV get absorbed into the sample to take some of electrons to the further excited state B Find quantum numbers of the states A and B YnA 2 ng 4 4 B 3 na 1 ng 4 2 nA 3 ng 4 4 n 1 n 5 NA

The ratio of molecular mass of two radioactive substances is 3 2 and the ratio of their decay constants is 4 3 Then the ratio of their initial activity per mole will be 1 2 2 819 3 3 4 8

A certain radioactive element disintegrates with a decay constant of 7 9 x 10 10 sec At a given instant of time if the activity of the sample is equal to 55 3 x 10 disintegration then number of nuclei at that instant of sec time a 7 0 1021 c 4 27 x 10 b 4 27 10 3 d 6 x 1023 TS EAMCET 15

33 The K wavelength emitted by an atom of atomic number Z 61 is The atomic number for an atom that emits K radiation for wavelength is 4 1 120 3 121 2 122 4 124

7 If the energy in the first excited state in hydrogen ator is 23 8 eV then the potential energy of a hydroge atom in the ground state can be assumed to be 1 10 eV 2 23 3 eV 3 13 6 eV 4 Zero

60 How many elementary particles are emitted whe C transforms to N 6 1 One 3 Three 2 Two 4 Four

A nucleus with mass number 220 initially at rest emits an a particle If the Q value of the reaction is 5 5 MeV the K E of the a particle is 1 4 4 MeV 2 5 4 MeV 3 5 2 MeV 4 5 1 MeV

2 An alpha nucleus of energy mv bombards a heavy nuclear target of charge Ze Then the distance of closest approach for the alpha nucleus will be proportional to 1 1 3 v 2 4 1 Ze 1 m

8 The potential energy U of diatomic molecules as a function of separation ris shown in figure Identify the correct statement Ju BC A T I O a The atoms are in equilibrium ifr OA b The force is repulsive only if r lies between A and B c The force is attractive if r lies between A and B d The atoms are in equilibrium ifr OB

A proton and an a particle are initially at a distance r apart Find the KE of a particle at a large reparation from proton after being released

The electron and the proton in a hydrogen atom 0 53 x 10 11 m apart The ratio of electrostatic and gravitational forces is a 44 x 10 41 c 18 1042 b 36 x 10 22 d 68 x 10 38

18 A nucleus of mass 220 amu in free state decays to emit an a particle Kinetic energy of the a particle emitted is 5 4 MeV The recoil energy of the daughter nucleus is 1 0 25 MeV 2 0 5 MeV 3 0 1 MeV 4 0 75 MeV

The electrostatic energy of Z prot ns uniformly distributed throughout a spherical nucleus of radius R is given by 3 Z Z 1 e 5 4 R The measured masses of the neutron 1H 15N and 150 are 1 008665 u 1 007825 u 15 000109 u and 15 003065u respectively Given that the radii of both the 15N and 150 nuclei are same 1 u 931 5 MeV c c is the speed of light and e 4 1 44 MeV fm Assuming that the difference between the binding energies of 15N and 150 is purely due to the electrostatic energy 2016 the radius of either of the nuclei is 1 fm 10 5m A 2 85 fm C 3 42 fm B 3 03 fm D 3 80 fm

A doped semiconductor has impurity levels 30 meV below the conduction band In a thermal collision an amount kT of energy is given to the extra electron loosely bound to the impurity ion and this electron is just able to jump into the conduction band What is the temperature T of a semi conducting material Find the value

A radio isotope X with a half life 1 4 10 yr decays to Y which is stable A sample of the rock from a cave was found to contain X and Y in the ratio 1 7 The age of the rock is 2014 a 1 96 10 yr 420x10 vr 5 c b 3 92 10 yr d 840 10 vr

10 Na23 being unstable decay into stable Na the nuclear mass are m 0Na23 22 994466 amu m Na23 22 989770 amu and mass of electron 11 0 000545 amu then find the approximate kinetic energy of the emitted electron 1 2 236 MeV 3 4 374 MeV 2 4 022 MeV 4 3 863 MeV

A moving neutral small particle of mass of 7 neutrons makes a head on collision with a double ionized Lithium atom in its ground state If the minimum KE of the particle for which inelastic collision takes place 7m so that the Lithium atom jumps to its 4th excited state is 51n 2 eV find the value of n BY E 51a m Sm 4 GM Yem MY 10m Va 74 TO

The following image is an example of Select one O O 00 m 3 Li Nuclear fission Nuclear fusion Be Radioactive decay Synthesis

3 4 94 4 He Fission or fusion 4 De Fission or fusion 59 238 U 92 H Fission or fusion 56 Fe 26 12 C 265 Hs 108 Fission or fusion 128Te 52 39 Ni Fission or fusion 262Db Fission or fusion Mo 0 Fission or fusion 28Si Be

Select one De Nuclear Change 1 Question 10 Deep in the core of the Sun 620 million metric tons of hydrogen nuclei are converted into 616 million metric tons of helium nuclei every second What happens to the missing mass in the Sun s core a O O O O The missing mass is transformed into energy in a fission reaction The missing mass is transformed into energy in a fusion reaction The missing mass is converted to heat during an exothermic chemical reaction that produces a new chemical species The missing mass is converted to heat during an endothermic chemical reaction that produces a new chemical species

Nuclear Change 1 Question 6 The change in mass during a nuclear reaction is given by which equation Select one None of the answer choices Q mc t E mc AGAH TAS

What are properties of an alpha particle Choose all that apply has no affect on atomic number increases the atomic number by 1 is a form of electromagnetic energy a helium nucleus has no affect on atomic mass an electron Ostrongest form of radiation decreases the atomic number by 2 weakest form of radiation

What is Binding Energy O The energy that prevents a neutron from decaying O The energy that causes fission O The energy that holds the nucleus together O The energy that keeps the electrons attracted to the protons O The energy keeps molecules together

Scientists uncover a meteorite that has 12 7 of its original Al 26 amount How long ago was the meteorite formed The half life of Al 26 is 720 000 years 1 Point O 3 6 106 y O 4 8 10 y O 5 2 x 106 y C 21 x 106 y V

What is the binding energy of helium 4 atom given that its actual atomic mass is 4 002603 c 3 0x108 m s m of proton 1 007276 m of neutron 1 008665 m of electron 0 000549 1 1 66 10 27kg 1 MeV 1 602 10 1 J 1 Point 2 8 MeV O 28 MeV O280 MeV O 4 49 10 12 MeV

Hydrogen 3 has a half life of 12 35 years What mass of hydrogen 3 will remain from a 100 0 mg initial sample after 5 0 years Point 07mg O 24 mg 76 mg O 18 mg

1 State the number of neutrons and protons in each of the following nuclei 2H 197 Fe b BC d a C 26

What conditions in the nucleus usually result in beta decay O a O b Oc Od The nucleus has too many neutrons The nucleus has too many protons The valence electrons are lost The atomic mass is greater than 300 amu

2 Complete the following table below Atomic Number 1 19 20 82 82 Proton to Neutron Ratio for a Stable Nucleus

The half life of calcium 47 is about 5 days Starting with 64 g of this isotope what would be the amount remaining after 20 days 32 16 Oc 8 Od 4 a O b

2 Which of the following accurately describes why massive stars can no longer fuse elements at their cores once the core has become exclusively iron Select one OA Fusion of iron does not produce energy so it is the natural end point of core fusion OB Hydrogen and helium are the only elements that can take part in fusion reactions OC The iron core immediately collapses to become a white dwarf D As an element iron nuclei are unstable and they immediately decay into other elements OE Chuck Norris forbids iron fusion as he requires massive quantities of it to manufacture his all in one workout station the Total Gym

What are properties of a gamma ray Choose all that apply O an electron O has no affect on atomic mass O a helium nucleus increases the atomic number by 1 strongest form of radiation has no affect on atomic number is a form of electromagnetic energy O weakest form of radiation decreases the atomic number by 2

What is Binding Energy The energy that keeps the electrons attracted to the protons The energy that holds the nucleus together The energy that prevents a neutron from decaying O The energy that causes fission The energy keeps molecules together

Define the term Fusion O The release of a gamma ray O When a neutron decays into a proton and release a beta particle O A nuclear reaction where a large atom splits into two or more smaller atoms O A nuclear reaction where two or more small atoms combine to make a larger atom

Define the term Fission When a neutron decays into a proton and release a beta particle O A nuclear reaction where two or more small atoms combine to make a larger atom O The release of a gamma ray O A nuclear reaction where a large atom splits into two or more smaller atoms

5 Name several things that people ordinarily regard as real br that according to atomic materialism are not real

Complete the fission reaction below by choosing the right isotope to go in the blank Ba 3 n 37 Rb 52 Kr 36 92 Rb

2 Calculate the energy released in the decay of C to B The mass of 1C is 11 011433 u The mass of B is 11 009305 u

3 226Ra becomes an isotope of Rn in one reaction What is the number of nucleons in this Rn isotope and what particle is emitted

5 A 137Ce atom emits very higher energy photons in one reaction What is this type of decay reaction and what atom is left over give element name and nucleon

21 How many different 3s states does the hydrogen atom have 02 O 10

Calculate the nuclear diameter of Express your answer to two significant figures and include the appropriate units 238 U H

How many protons and how many neutrons are in 224 4Ra Enter your answers numerically separated by a comma AEO O

Solar luminosities 104 10 10 10 10 10 103 104 105 10 20 000 Spica hs O a Sirius B b the Sun c Betelgeuse Mizar Sirius Regulus Algol lega Sirius B 10 000 Polaris Castor Altair Procyon Cep Capella Sun Procyon B a Centauri A T Ceti a Centauri B 5000 Surface temperature kelvins Arcturus Pollux Mira 3000 Antares Aldebaran 2000 D Which of the stars above is currently fusing elements heavier than hydrogen at its core

3 When Einstein wrote his paper revealing his supposition that mass and energy were simply different forms of the same thing it was a hypothesis JUST A POSSIBLE EXPLANATION based on mathematical and philosophical ideas What evidence accumulated between 1905 and the present day about energy and mass that turned his hypothesis into scientific truth