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How to calculate the number of spectral lines emitted or absorbed ?
a proper defination of "distance of closest approach."
A 12.5 eV electron beam is used to bombard gaseous hydrogen at room temperature. What series of wavelengths will be emitted?
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.
what is the value of impact parameter for a head on collision?
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?
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
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.
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 32P15.
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
If a electron is moving around a nucleus of charge 2e in a circular orbit of radius 10^-10 m ,then calculate the intial frequency of light emitted by the electron.
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
Why is charge on alpha particle 2e and not e ?
The electron, in a hydrogen atom, initially in a state of quantum number n1
The radius of the innermost electron orbit of a hydrogen atom is 5.3 ×10−11 m. What are the radii of the n = 2 and n =3 orbits?
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?
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.
Please explain me Line emission spectrum, band emission spectrum, line absorption spectrum and band absorption spectrum in simple language or post a video related to it if it's possible....
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Syllabus
How to calculate the number of spectral lines emitted or absorbed ?
159. A nucleus at rest disintegrates emitting an - particle. Q-value of the process and energy of the -particle emitted are 10.2 MeV and 10 MeV respectively. Atomic mass of the nucleus is
(1) 196
(2) 200
(3) 294
(4) 208
a proper defination of "distance of closest approach."
A 12.5 eV electron beam is used to bombard gaseous hydrogen at room temperature. What series of wavelengths will be emitted?
(1) Greater than 90o (2) Equal to 90o
(3) Less than 900 (4) Both (1)&(2)
corresponding to K, Land M shells are 40.2 keV, 21.8 keV and 11.5 keV respectively, what should be
the minimum value of E to produced L? X?rayfrom the atom :
(A) 11.5 keV (B) 21.8 keV (C) 40.2 keV (D) 10.3 keV
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)
(2)
(3)
(4) Zero
what is the value of impact parameter for a head on collision?
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?
34. Find the value of acceleration a for which point x is exposed to air as shown in the figure.
why ZnS screen was used by rutherford?
6. Deduce the expression for the total energy of the electron in the nth orbit of a hydrogen atom in the Bohr model.
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.
(1) 1.25 s
(2) 2.5 s
(3) 5 s
(4) 40 s
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
(A) decreasing the temperature of the filament
(B) increasing the p.d. between the cathode and the target
(C) reducing the pressure in the tube
(D) using a target material of higher relative atomic mass
Q). An H atom has been excited to orbital. What is the maximum number of lines it can emit during deexcitation.
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.
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 ?
(1) 13.6 eV
(2) 108.8 eV
(3) 54.4 eV
(4) 12.08 eV
how does de broglie explain bohrs 2nd postulate
plzz explain in simple words
and reply as fast as possible
Ans is 1.67×10^-14m,0.835×10^-14m
Why is it that most of the a-particles go right through the foil and only a small fraction gets scattered at large angles?
Draw the trajectory of the α-particle in the coulomb field of a nucleus.
Explain the origin of continuous X-ray spectrum.
9. The angular speed of electron in the n th orbit of hydrogen atom is
(1) Directly proportional to n2
(2) Directly proportional to n
(3) Inverse proportional to n3
(4) Inversely proportional to n
Q.(h) For de-excitation of electrons from n = 5 to n = 2 possible number of spectral lines emitted will be
(1)10
(2) 6
(3) 4
(4) 8
ans is 5.7×10^-14m less than 5.7×10^-14.
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?
(1) x ln 2
(2) - x ln 2
(3)
(4)
Find ratio of ionisation energy of Bohr's hydrogen atom and hydrogen like lithium atom .
A and B are two sources generating sound waves. A listener is situated at C. The frequency of the source at A is 500 Hz. A, now, moves towards C with a speed 4m/s. The number of beats heard at C is 6. When A moves away from C with speed 4 m/s, the number of beats heard at C is 18. The speed of sound is 340 m/s. The frequency of the source at B is:
(a) 500 Hz
(b) 506 Hz
(c) 512 Hz
(d) 494 Hz
1. draw thw graph showing the distribution of kinetic energy of electrons emitted during beta decay.
2. write nuclear process for beta decay of 32P15.
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 PA, PB and PC, are the pressures at A, B and C respectively then.
1. PA > PB = PC 2. PA < PB < PC 3. PA < PB = PC 4. PA > PB > PC
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
If a electron is moving around a nucleus of charge 2e in a circular orbit of radius 10^-10 m ,then calculate the intial frequency of light emitted by the electron.
b) estimate the ratio of de-Broglie wavelengths associated with deuterons and alpha particles when they are accelerated through the same accelerating potential V
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
Q. The energies of three conservative energy levels of hydrogen atom are
respectively. A photon of wavelength is emitted for a transition . What will be the wavelength of emission for transition ?
what is dynamic mass of a photon of frequency v ?
Ans is 1.8×10^-13.
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
Why is charge on alpha particle 2e and not e ?
The electron, in a hydrogen atom, initially in a state of quantum number n1
ans is 6504armstrong.
(1) Total energy of each level increases
(2) The difference in total energy of any two level remains same
(3) Kinetic energy in each level remains same
(4) All of these
The radius of the innermost electron orbit of a hydrogen atom is 5.3 ×10−11 m. What are the radii of the n = 2 and n =3 orbits?
1. K and L
2. L and K
3. N and L
4. 2 and 3 both
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 does these lines mean ?
How condensed matter and dense gases emit EM radiations ?
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?
Won't the answer be C??
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.
Please explain me Line emission spectrum, band emission spectrum, line absorption spectrum and band absorption spectrum in simple language or post a video related to it if it's possible....