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

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

a proper defination of "distance of closest approach."

ans is 6547.6 armstrong

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.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?

Q.9. The maximum wavelength that a sample of hydrogen atoms can absorb is

(1) 912 Å

(2) 1216 Å

(3) 1028 Å

(4) Infinite

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.

Q. Water is flowing through a channel (lying in a vertical plane) as shown in the figure. Three sections A, B and C are shown, Sections B and C have equal area of cross section. If P

_{A}, P_{B}and P_{C}, are the pressures at A, B and C respectively then.1. P

_{A}> P_{B}= P_{C}2. P_{A}< P_{B}< P_{C}3. P_{A}< P_{B}= P_{C}4. P_{A}> P_{B}> P_{C}what is the significance of negative energy of electrons in the orbit?

Q.(i) If n = 1 is taken to be reference of the potential energy, what will be the kinetic energy (in eV) electron in second excited state in $L{i}^{2+}$?

(1) 13.6 eV

(2) 108.8 eV

(3) 54.4 eV

(4) 12.08 eV

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?Ans is 1.8×10^-13.

Ans is 1.67×10^-14m,0.835×10^-14m

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,λ3.8.Write down the result of Rutherford

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.

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?

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}.59. Like angular momentum, which other physical quantity is quantised in Bohr's model of hydrogen atom?

(1) Kinetic energy

(2) Magnetic moment

(3) Potential energy

(4) Mechanical energy

Solve this :$9.\mathrm{Calculate}\mathrm{the}\mathrm{energy}\mathrm{released}\mathrm{in}\mathrm{MeV}\mathrm{in}\mathrm{the}\mathrm{following}\mathrm{nuclear}\mathrm{reaction}:\phantom{\rule{0ex}{0ex}}{}_{92}{}^{235}\mathrm{U}\underset{}{\to}{}_{90}{}^{234}\mathrm{Th}+{}_{2}{}^{4}\mathrm{He}+\mathrm{Q}\phantom{\rule{0ex}{0ex}}\mathrm{Given}:\phantom{\rule{0ex}{0ex}}\mathrm{Atomic}\mathrm{mass}\mathrm{of}{}^{238}\mathrm{U}=238.05079\mathrm{u}\phantom{\rule{0ex}{0ex}}\mathrm{Atomic}\mathrm{mass}\mathrm{of}{}^{234}\mathrm{Th}=234.04363\mathrm{u}\phantom{\rule{0ex}{0ex}}\mathrm{Atomic}\mathrm{mass}\mathrm{of}{}^{4}\mathrm{He}=4.00260\mathrm{u}\phantom{\rule{0ex}{0ex}}1\mathrm{u}=\frac{931.5\mathrm{MeV}}{{\mathrm{c}}^{2}}\phantom{\rule{0ex}{0ex}}\mathrm{Is}\mathrm{this}\mathrm{decay}\mathrm{spontaneous}?\mathrm{Given}\mathrm{reason}.$

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). When is ${H}_{\alpha}$ line in the emission spectrum of hydrogen atom obtained? Calculate the frequency of the photon emitted during this transition.

_{0}/3 form I_{0}after travelling 3.5 cm inside a target, then its intensity after travelling next 7 cm will be how much?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 ?

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

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.

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

Q). An H atom has been excited to $4{d}_{{x}^{2}-{y}^{2}}$ orbital. What is the maximum number of lines it can emit during deexcitation.

^{-27}m/s)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

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

17. For the nuclear fusion reaction $\begin{array}{c}2\\ 1\end{array}\mathrm{H}+\begin{array}{c}3\\ 1\end{array}\mathrm{H}\to \mathrm{He}+\begin{array}{c}1\\ 0\end{array}\mathrm{n}$ temperature to which gases must be heated is 3.7 x 10

^{9}K. Potential energy between two nuclei is closest to (Boltzmann's constant k = 1.38 x 10^{-23}J/K)(1) -10

^{-10}J (3) -10^{-12}J(2) -10

^{-14}J (4) -10^{-13}JQ.12. Let ${F}_{1}$ be the frequency of second line of Lyman series and ${F}_{2}$ be the frequency of first line of Balmer series then frequency of first line of Lyman series is given by

(1) ${F}_{1}$ - ${F}_{2}$

(2) ${F}_{1}$ + ${F}_{2}$

(3) ${F}_{2}$ - ${F}_{1}$

(4) $\frac{{F}_{1}{F}_{2}}{{F}_{1}+{F}_{2}}$

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?^{o}be 28 per minute. Then the number of particles scattered per minute by the same foil, but at 60^{o}is.1. K and L

2. L and K

3. N and L

4. 2 and 3 both

Q.9.(a) Derive the expression for the radius of the nth orbit of hydrogen atom using Bohr's postulates. Show graphically the (nature of) variation of the radius of orbit with the principal quantum number, n.

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?

The spectrum of a star in the visible the ultraviolet region was observed and the wavelength of some of the lines that could be identified were found to be 824Å,970Å, 1120Å,2504Å, 5173Å 6100Å.Which of these lines cannot belong to hydrogen spectrum?

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}