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Syllabus

How to calculate the number of spectral lines emitted or absorbed ?

a proper defination of "distance of closest approach."

2. In an isolated Li

^{2+}. electron jumps from n = 2 to n = 1 . What is the recoil momentum of the ion (in kg- m/s)(1) 5.44 x 10

^{-27}(2) 48.96 x 10^{-27}(3) 16.32 x 10

^{-27}(4) 8.16 x 10^{-27}A 12.5 eV electron beam is used to bombard gaseous hydrogen at room temperature. What series of wavelengths will be emitted?

^{0}.Calculate the wavelength of the first line in the given spectrum.^{++}) ion has the same energy as the groundstate energy of the hydrogen atom?

In Rutherford experiment the number of alpha-particle scattered through an angle of 60 is 112 per minute,the find the number of alpha particle scattered through an angle of 90 per minute by the same nucleus.

1. why alkali metals are most suitable as photosensitive surfaces?

2. can we get photoemission with an intense beam of radiowaves?

3. is photoelectric emission at all frequencies?

4. what is minimum angular momentum of electron in hydrogen atom?

5. which quantity of the orbiting electron has same dimension as that of h?

6. how many spectral lines are possible in hydrogen spectrum?

7. which hydrogen spectral series is found first?

8. which parameter is same for all photons in laser tube?

9. which microscope will you use to study surface structure of different materials?

emitted?

1)n=4 to n=3

2)n=4 to n=2

3)n=2 to n=1

4)n=3 to n=1

why ZnS screen was used by rutherford?

plz calculate the ratio of energies of photons produced due to transition of electron of hydrogen atom from its a)second permitted energy level to the first level b) highest permitted energy level to the second permitted level.

what is the significance of negative energy of electrons in the orbit?

The total energy of an electron in the first excited state of the hydrogen atom is about −3.4 eV.

(a)What is the kinetic energy of the electron in this state?(b)What is the potential energy of the electron in this state?(c)Which of the answers above would change if the choice of the zero of potential energy is changed?find distance of closest approach when 5Mev proton approaches a gold nucleus(Z=79)?

the answer is 2.3X10^-14.........but im not able to get this answer

of the plate is removed as indicated. The distance of centre of mass of the remaining

portion from the centre of the original square plate is

For a certain atom,there are energy levels A,B,C corresponds to energy values EA<EB<EC.Ifλ1,λ2,λ3 are the wavelengths of radiations corresponding to transisition from C to B,B to A, and C to A respectively.Then find a relation betweenλ1,λ2,λ3.(a) V electron volt (b) 3V/4 electron volt (c) 4V/3 electron volt.

Q.10. A potential difference of 20 kV is applied across on X-ray tube. Find the minimum wavelength of X-rays generated

(1) 0.62 Å

(2) 0.92 Å

(3) 0.96 Å

(4) Zero

how does de broglie explain bohrs 2nd postulate

plzz explain in simple words

and reply as fast as possible

Explain the origin of continuous X-ray spectrum.

Find ratio of ionisation energy of Bohr's hydrogen atom and hydrogen like lithium atom .

^{-27}m/s)1. draw thw graph showing the distribution of kinetic energy of electrons emitted during beta decay.

2. write nuclear process for beta decay of

^{32}P_{15}.A radioactive material is reduced to 1/16 of its original amount in four days. How much material should one begin with so that 4 * 10^-3 kg of the material is left after six days?

A small compas needle of magnetic moment 'M' and moment of inertia 'I' is free to oscillate in a magnetic field 'B;. It is slightly disturbed from its equilibrium position and then realesed. show thet it executes simple harmonic motion. hence write the expression for its time period

Q. The energies of three conservative energy levels ${L}_{3},{L}_{2}and{L}_{1}$ of hydrogen atom are ${E}_{0},\frac{4{E}_{0}}{9}and\frac{{E}_{0}}{4}$

respectively. A photon of wavelength $\lambda $ is emitted for a transition ${L}_{3}to{L}_{1}$. What will be the wavelength of emission for transition ${L}_{2}to{L}_{1}$?

$1.\frac{16\lambda}{31}\phantom{\rule{0ex}{0ex}}2.\frac{27\lambda}{7}\phantom{\rule{0ex}{0ex}}3.\frac{19}{20}\lambda \phantom{\rule{0ex}{0ex}}4.\lambda $

what is dynamic mass of a photon of frequency v ?

1. An alpha particle of energy 5 MeV is scattered through 180° by a fixed uranium nucleus. The distance of closest approach is of the order of

(a) 1 $\dot{A}$ (b) 10

^{-10}cm(c) 10

^{-}^{12}cm (d) 10^{-15}cmHow long will a radioactive isotope, whose half life is T years, take for its activity to reduce to 1/8

^{th}of its initial value?2.If a ball is thrown upwards from the surface of earth(1) The earth remains stationary while the ball moves upwards

(2) The ball remains stationary while the earth moves downwards

(3) The ball and earth both move towards each other

(4) The ball and earth both move away from each other

a larger circular coil of radius R and a small circular coil of radius r are put in vicinity of each other . if the cofficient of mutual induction of this pair equals 1mH , what would be the flux linked with the larger coil , when a current of 0.5 A flow through the smaller coil ?

IN GEIGER MARSDEN EXPERIMENT CALCULATE THE OF CLOSEST APPROACH TO THE NUCLEUS OF Z=75, WHEN AN ALPHA PARTICLE OF 5MEV ENERGY IMPINGS ON ITBEFORE IT COMES MOMENTARILY TO REST AND REVERES ITS DIRECTION.PLEASE ANSWER SOON

The radius of the innermost electron orbit of a hydrogen atom is 5.3 ×10

^{−11}m. What are the radii of then= 2 andn=3 orbits?ans is 106 armstrong.

(i) 3P/8 (ii) 7P/6 (iii) 11P/5 (iv) 9P/4

1. K and L

2. L and K

3. N and L

4. 2 and 3 both

what is the value of impact parameter for a head on collision?

using rutherford model of the atom .derive the expression for the total energy of the electron in hydrogen atom .what is the significance of total negative energy possessed by electron?

what is photoelectric effect

The electron, in a hydrogen atom, initially in a state of quantum number n1

ans 4.61×10^-15,1.01×10^8 m/s

1.Why rutherford use gold foil only?

2.Why bohr`s model can`t explain continous spectrum?

horizontal force F applied at the centre of the wheel. The minimum value of F is

a) 20

kgwtb) 1kgwtc) $10\sqrt{3}kgwt$ d) $10\sqrt{2}kgwt$Wat is the formula of Impact Parameter (b) and scatering angle?

Please help soon.

Thank U

ans is 6547.6 armstrong

The attractive potential for an atom is given by V=Vo ln(R/Ro),Vo and Ro are constant and R is the radius of the orbit.The radius R of the Nth bohr's orbit depends upon principal quantum number n as

^{th}orbit of hydrogen atom.