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Syllabus

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

a proper defination of "distance of closest approach."

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.

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.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?

^{o}was found to be 200 per minute. If the silver foil is replaced by aluminium (Z = 13) foil of same thickness, the number of alpha particles scattered per minute at 30^{o}is equal to.why ZnS screen was used by rutherford?

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

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?

Q.14. If the series limit wavelength of the Lyman series for hydrogen atom is 912 Å, then the series limit wavelength for the Balmer series for the H atom is

(1) $\frac{912}{2}$Å

(2) 912Å

(3) (912 $\times $ 2) Å

(4) (912 $\times $ 4) Å

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?^{-27}m/s)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.angular velocity of an electron occupying second orbit of Li2+ ion

I want answer involving h,pi,k etc as i got the answer for the other method ,ie, mv

^{2}/r = kZe^{2}/rhow 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.

^{++}) ion has the same energy as the groundstate energy of the hydrogen atom?

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

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

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) 2sec

(b) 2?3 sec

(c) 4sec

(d) 4?3 sec

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.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

what is dynamic mass of a photon of frequency v ?

1. K and L

2. L and K

3. N and L

4. 2 and 3 both

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

Q5. A charged oil drop falls with terminal velocity V

_{e}in the absence of electric field. An electric field E keeps it stationary. The drop acquires additional charge q and starts moving upwards with velocity V_{e}. The initial charge on the drop was1) 4q 2) 2q 3) q 4) q /2

^{th}excited state to ground state. If ‘x’ are the number of different UV radiations, y are the number of different visible radiations and ‘z’ are the number of different infrared radiations. The value of Z-(x+y) isAssume all the Balmer lines lie within visible region

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?

Q.14. An electron moves around the nucleus in a hydrogen atom of radius 0.51 Å, with a velocity of $2\times {10}^{5}$ m/s. Calculate the following:

(a) the equivalent current due to orbital motion of electron,

(b) the magnetic field produced at the centre of the nucleus, and

(c) the magnetic moment associated with the electron.

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?A 'muon' is a particle that has the same charge as an electron but is 200 times heavier than it. If we had an atom in which the muon revolves around a proton instead of an electron, what would be the magnetic moment of the muon in the ground state of such an atom.

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?

electron. is

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

Find the acceleration of an electron in an electric field E of magnitude 50 V/cm .

e/m of an electron is 1.76 * 10

^{11}C kg^{-1}what is photoelectric effect

a) 6.62 x 10

^{15}b) 100

c) 1000

d) 1

hey check this out experts..... http://cbsephysics.2lv.in/2009/09/alpha-particle-scattering-and.html

someone copied whole page....once while searching omething on google i found a page(a blog a guess) copied a whole page of meritnation... ..sorry i dont have link.

...but the days are not away when whole paid study material will be available on net for free.

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

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

1.Why rutherford use gold foil only?

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

Wat is the formula of Impact Parameter (b) and scatering angle?

Please help soon.

Thank U

$\mathit{Q}\mathbf{.}\mathbf{}\mathbf{}Supposethepotentialenergybetweenelectronandprotonatadis\mathrm{tan}cerisgivenby\frac{-K{e}^{2}}{3{r}^{3}}.UseBohr\text{'}stheoremtofindvelocityanditsvaluewillbe\phantom{\rule{0ex}{0ex}}\left(1\right)V=\frac{nh}{2\mathrm{\pi mr}}\left(2\right)V=\frac{n{h}^{2}}{2\mathrm{\pi mr}}\phantom{\rule{0ex}{0ex}}\left(3\right)V=\frac{{n}^{2}h}{2\mathrm{\pi mr}}\left(4\right)Can\text{'}tbefound$

(a) V electron volt (b) 3V/4 electron volt (c) 4V/3 electron volt.

what are the drawbacks of rutherford model??? can u plz explain??