Recent questions tagged ncert

Suppose that the electric field part of an electromagnetic wave in vaccum is $E= 3.1 \times N/c $ an $[(1/8 rad/m)y +(5.4 \times 10^8\;rad/s/t)$ what is the amplitude of the magnetic field part of the wave ?

asked Aug 18, 2016 by meena.p

1 answer

Suppose that the electric field part of an electromagnetic wave in vaccum is $E= 3.1 \times N/c $ an $[(1/8 rad/m)y +(5.4 \times 10^8\;rad/s/t)$ write an expression for the magnetic field part of the wave

asked Aug 18, 2016 by meena.p

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Suppose that the electric field part of an electromagnetic wave in vaccum is $E= 3.1 \times N/c $ an $[(1/8 rad/m)y +(5.4 \times 10^8\;rad/s/t)$ what is the frequency of $\gamma$

asked Aug 17, 2016 by meena.p

1 answer

Suppose that the electric field part of an electromagnetic wave in vaccum is $E= 3.1 \times N/c $ cos $[(1/8 rad/m)y +(5.4 \times 10^8\;rad/s/t)$ what is the amplitude of the magnetic field part of the wave ?

asked Aug 17, 2016 by meena.p

1 answer

Suppose that the electric field part of an electromagnetic wave in vaccum is $E= 3.1 \times N/c $ an $[(1/8 rad/m)y +(5.4 \times 10^8\;rad/s/t)$ what is the direction of motion ?

asked Aug 17, 2016 by meena.p

1 answer

In a plane electromagnetic wave, the electric field oscillates sinusoidal at a frequency of $2.0 \times 10^{10}\;Hz$ and amplitude $48 vm^{-1}$. What is the wavelength of the wave ?Show that the total average energy density of magnetic field $( c= 3 \times 10^8 ms^{-1})$

asked Aug 17, 2016 by meena.p

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In a plane electromagnetic wave, the electric field oscillates sinusoidal at a frequency of $2.0 \times 10^{10}\;Hz$ and amplitude $48 vm^{-1}$. What is the wavelength of the wave ?

asked Aug 17, 2016 by meena.p

1 answer

Suppose that the electric field amplitude of an electromagnetic wave is $E_0 = 120 N/C$ and its frequency is $\gamma = 50.0 \;MHz$ . Find the expression of $\overrightarrow{E}$ and $\overrightarrow{B}$

asked Aug 17, 2016 by meena.p

1 answer

Suppose that the electric field amplitude of an electromagnetic wave is $E_0 = 120 N/C$ and its frequency is $\gamma = 50.0 \;MHz$ . Determine $B_0, w,k$ and $\lambda$

asked Aug 17, 2016 by meena.p

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The amplitude of the magnetic field part of a harmonic electro magnetic wave in vaccum is $B_0 =510\;nT$. What is the amplitude of the electric field part of the wave ?

asked Aug 17, 2016 by meena.p

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A changed particle oscillates about its mean equilibrium position with a frequency of $10^9\;Hz$. What is the frequency of electromagnetic waves produced by the oscillator ?

asked Aug 17, 2016 by meena.p

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A radio can tune any station in the $7.5 \;MHz$ to $12\;MHz$ band . What is the corresponding wave length band ?

asked Aug 17, 2016 by meena.p

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A plane electro magnetic wave travels in vaccum along z- direction . What can you say about the direction of its electric and magnetic field vectors ? If the frequency of the wave is $30\;MHz$ What is its wave length ?

asked Aug 17, 2016 by meena.p

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What physical quantity is the same for x- rays of wave length $10^{-10}m$ red light of wave length $6800A^{\circ}$ and radio waves of wave length $500\;m$?

asked Aug 17, 2016 by meena.p

1 answer

A parallel plate capacitor made of circular plates each of radius $R=6.0\;cm$ has a capacitance $c= 100\;pF$. The capacitor is connected to a $230\;v$ a.c supply with an angular frequency of $300\;rad\;S^{-1}$ . What is the r.m.s value of the conduction current ?.Is the conduction current equal to the displacement current ?

asked Aug 16, 2016 by meena.p

1 answer

A parallel plate capacitor made of circular plates each of radius $R=6.0\;cm$ has a capacitance $c= 100\;pF$. The capacitor is connected to a $230\;v$ a.c supply with an angular frequency of $300\;rad\;S^{-1}$ . What is the r.m.s value of the conduction current ?Determine the magnitude of Bata point 3.0 cm from the axis between the plates

asked Aug 16, 2016 by meena.p

1 answer

A parallel plate capacitor made of circular plates each of radius $R=6.0\;cm$ has a capacitance $c= 100\;pF$. The capacitor is connected to a $230\;v$ a.c supply with an angular frequency of $300\;rad\;S^{-1}$ . What is the r.m.s value of the conduction current ?

asked Aug 16, 2016 by meena.p

1 answer

The figure shows a capacitor made of two circular plate each of radius 12 cm and separated and separated by 5.0 mm . The capacitor is being changed by an external source (not shown in the figure ). The changing current is constant and equal to $0.15\;A$ Calculate the capacitor and the rate of change of potential difference between the plates. Is Kischoff's first rule valid at each plate of the capacitor?

asked Aug 16, 2016 by meena.p

1 answer

The figure shows a capacitor made of two circular plate each of radius 12 cm and separated and separated by 5.0 mm . The capacitor is being changed by an external source (not shown in the figure ). The changing current is constant and equal to $0.15\;A$ Calculate the capacitor and the rate of change of potential difference between the plates.obtain the displacement

asked Aug 16, 2016 by meena.p

1 answer

The figure shows a capacitor made of two circular plate each of radius 12 cm and separated and separated by 5.0 mm . The capacitor is being changed by an external source (not shown in the figure ). The changing current is constant and equal to $0.15\;A$ Calculate the capacitor and the rate of change of potential difference between the plates

asked Aug 16, 2016 by meena.p

1 answer

Complete the reaction : $n+_{92}U^{235} \to _{56} Ba^{144} $+ _____ $ + 3n $

asked Aug 16, 2016 by meena.p

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The radius of $G_e$ nuclide is measured to be twice the radius of $_4 Be^9$ . The no nucleolus in $Ge$ are

asked Aug 16, 2016 by meena.p

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Half lives of two ratio active substance A and B are respectively 20 minutes . Initially the samples of A and B have equal number of nuclei. after 80 minutes the ratio of remaining numbers of A and B nuclei is

asked Aug 10, 2016 by meena.p

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Taking the Bohr radius as $a_0 = 53\;pm$ the radius of $Li^{++}$ ion in its ground state on the basis of Bohr's model will be about

asked Aug 10, 2016 by meena.p

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Obtains the maximum kinetic enery of $\beta$ particles and the radiation frequencies of $\gamma$ decays in the delay scheme . You are given that $m(_{79}Au^{198})=197.9682334\;u$$\qquad m(_{80}Hg^{198})=197.966760\;u$

asked Aug 10, 2016 by meena.p

1 answer

Consider the so called $D-T reaction$ (determination - tritium) calculate the energy released in Mev in this reaction from the data $m(_1H^2)=2.0141024 $ and $m(_1H^3) =3.0160494$

asked Aug 9, 2016 by meena.p

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Consider the so called D -T reaction (deuterium - tritium fusion ) $_1H^2 +_1H^{3} \to _2He^{4} +n$ consider the radius of both detriment and tritium to be approximately $2.0\;fm$ . What is the kinetic energy needed to overcome the coulomb repulsion between the two nuclei? To what temperature must the gases be heated to initiate the reaction ?

asked Aug 9, 2016 by meena.p

1 answer

Consider the fission of $_{92}U^{238}$ by fast neutrons. In one fission event , no neutron are emitted and the final stable end products , after the beta decay of the primary fragments are $_{58}Ce ^{140}$ and $_{44}Ru ^{99}$ . Calculate Q for this fission process . The relevant atomic and particle masses are :$m(_92U^{238})=238.05079\;u$$m(_{34} Ru^{99}) = 98.90594\;u$$m(_{58}Ce^{140})=139.90543\;u$

asked Aug 9, 2016 by meena.p

1 answer

Under certain circumstance , a nucleolus can decay by emitting a particle more massive than an $ \alpha$ particle . Consider the following : $_{88}Ra^{223} \to _{86} Rn ^{219} +_2 He ^{14}$ Calculate the Q value for this decay and determine if it energetically possible .

asked Aug 9, 2016 by meena.p

1 answer

Under certain circumstance , a nucleolus can decay by emitting a particle more massive than an $ \alpha$ particle . Consider the following : $_{88}Ra^{223} \to _{82} Pb ^{209} +_6C^{14}$ Calculate the Q value for this decay and determine if it energetically possible .

asked Aug 5, 2016 by meena.p

2 answers

A Source contains two phosphors radio nuclides $ _{15}P^{32}(T_{1/2}=14.3\;days)$ and $_{15}P^{33} (T_{1/2} =25.3\;day)$ Initially $10\%$ of the decays come from $_{15}P^{33}$. How long one must wait until $90\%$ do so ?

asked Aug 5, 2016 by meena.p

1 answer

The neutron separation energy is defined to be the energy required to remove a neutron from a nucleus. Obtain the neutron separation energy of the nuclei $_{20}Ca ^{41}$ from the following data :$_{13} Al ^{27} \to _{13}Al^{26}+_0 n^1$

asked Aug 5, 2016 by meena.p

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The neutron separation energy is defined to be the energy required to remove a neutron from a nucleus. Obtain the neutron separation energy of the nuclei $_{20}Ca ^{41}$ from the following data : $m(_{20}Ca^{40})=39.962591\;u,m(_{20}Ca^{41})=40.962278\;u,m(_{13}Al^{27})=26.981514\;u$

asked Aug 5, 2016 by meena.p

1 answer

In a periodic table the average atomic mass of magnesium is given as $24.312\;u$ The average value is based on their relative natural abundance on earth. The three isotopes and their masses are $_{12} Mg^{24}(23.98504\;u)$, $_{12} Mg^{25}(24.98584\;u)$ and $_{12} Mg^{24}$ is $78.99\%$ by mass. Calculate the abundances of the other two isotopes.

asked Aug 4, 2016 by meena.p

1 answer

For the $\beta^+$ (positron) emission from a nucleus, there is another competing process known known as electron capture.Electron from an inner orbit is captured by the nucleus and a neutrino is emitted. $\beta^+$ emission is energetically allowed , electron capure is necessarily allowed but not vice- versa . Is this a true statement ?

asked Aug 4, 2016 by meena.p

1 answer

From the relation $R=R_0A^{1/3}$, where $R_0$ is a constant and A is the mass number of a nucleus , show that the nuclear matter density is nearly a constant (ie independent of A)

asked Aug 4, 2016 by meena.p

1 answer

Calculate the height of potential barrier for a head on collision of two denterons. The effective radius of deuteron can be taken to be $2 fm$ . Note that height of potential barrier is given by the coulmb repulsion between two denterons when they just touch each other .

asked Aug 3, 2016 by meena.p

1 answer

How long an electric lamp of $100 w$ be kept glowing by fusion of $2.0\;kg$ of deuterium ?

asked Aug 3, 2016 by meena.p

1 answer

A thousand reactor factor consume half of its fuel in 5.00 y . How much $_{92} U^{235}$ did it contain initially ? Assume that the reactor operates $80\%$ of the time and that all the energy generated arises from the fission of $_{92}U^{235}$ and that this nuclide is consumed by the fission process ?

asked Aug 3, 2016 by meena.p

1 answer

The fission properties of $_{84}Pu^{237}$ are similar to those of $_{92} U^{35}$ . The average energy released per fission is $180\;Mev$ How much energy in Mev is released if all the atoms in 1 kg of pure $_{94} Pu ^{239}$ undergo fission .

asked Aug 3, 2016 by meena.p

1 answer

Suppose we think of fission of a $_{26}Fe^{56}$ nucleus into two fragment $_{13} Al ^{26}$. Is the fission energetically possible ? Argue by working out Q of the process. cives.

asked Aug 3, 2016 by meena.p

1 answer

The Q value of a nuclear reaction $A+b=c+A$ is defined by $[m_A+m_b-m_c-m_d] C^2$ where masses refers to the respective nuclei. Determine from the given data the Q value of the following reaction and state whether the reaction are exothermic or endothermic . $_6C^{12}+_6C^{12} \to _{10}Ne^{20} +_2He^4$

asked Aug 2, 2016 by meena.p

1 answer

The Q value of a nuclear reaction $A+b=c+A$ is defined by $[m_A+m_b-m_c-m_d] C^2$ where masses refers to the respective nuclei. Determine from the given data the Q value of the following reaction and state whether the reaction are exothermic or endothermic .$_1H^1+_1H^3 \to _1H^2 +_1H^2$

asked Jul 22, 2016 by meena.p

1 answer

The nucleus $_{10} Ne ^{23}$ decays by $\beta ^{-}$ emission. write down the $\beta^{-}$ decay equation and determine the maximum kinetic energy of the electrons emitted from the following data. $ m (_{10} Ne ^{23} ) = 22.994466\;amu \;\qquad m (_{11} Na ^{23} ) = 22.989770\;amu $

asked Jul 22, 2016 by meena.p

1 answer

The radio nuclide $_6C^{11}$ decays according to $_6C^{11} \to _5B^{11}+e^++\gamma$ half life $=20.3\;min$ The maximum energy of the emitted position is $0.960\;Mev$ given the mass values $m(_6C^{11})=11.011434 \;u\;m (_6B^{11})=11.009305$ calculate Q and compare it with maximum energy of position emitted .

asked Jul 13, 2016 by meena.p

1 answer

Given $m(_{86} R_n ^{220} =220.1137\;u; m(_{84}Po^{216})=216.00189u$ and $m_{\alpha}=4.00260 \;u$ Find the Q value and K.E of the emitted $ \alpha$ particle in the $\alpha$ decay of $_{86} Rn ^{220}$

asked Jul 13, 2016 by meena.p

1 answer

Find the Q value and the kinetic energy of emitted $\alpha$ particle in the $\alpha$ decay of $_{88} Ra ^{226}$

asked Jul 13, 2016 by meena.p

1 answer

Obtain Approximately the ratio of the nuclear radii of the gold isotope $_{79} Au^{197}$ and silver isotope $_{4}Ag^{107}$

asked Jul 13, 2016 by meena.p

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The half life of $_{38} Sr ^{90}$ is 28 years . What is the disintegration rate of $15\;mg$ of this isotope?

asked Jul 13, 2016 by meena.p

1 answer

Obtain the amount of $_{27}Co^{60}$ necessary to provide a radio active source 0f $8.0\;mci$ strength. Half life of $_{27} Co ^{60}$ is $5.3$ years

asked Jul 13, 2016 by meena.p

1 answer

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