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Syllabus

what does partially evacuated tube mean?what is its use?if the tube is partially evacuated then what is left inside it?please explain it in simple words and in detail

Please draw a 3-D diagram for this poor student. Please, It will be very helpful to me.

A)n=2,l=1

B)n=4,l=2

C)n=3,l=2

(A) 8.29, 9.32 (B) 9.32, 8.29 (C) 9.32, 9.32 (D) 8.29, 8.29

difference between frequency and wavelength

^{22 }photons per second.Find The Wavelength of the light.(i) number of sub-shells. (i) number of orbitals

what is electromagnetic radiation that is emitted by atom?

electromagnetic radiation emitted by atoms what does this mean???

what is the wave theory of light ?

What is the orbital angular momentum of an electron in f orbital ?

max no of electron in subshell with l = 3 and n = 4

how do atoms emit electromagnetic radiation?what is that electromagnetic radiaton?how do atoms absorb electromagnnetic radiation??

what is the maxwell theory of electromagnetic radiation

what is ionisation?what are ions?how does ionisation take place?plz explain in simple words

can anyone show us in diagram where exactly are subshell.Books mention shell is divided into subshells as s p d f how horizontaly vertically or at circle ?

Ans key: Q4 - (c)

Q5 - (b).

Please explain how?!?

Comprehension-2: (Q,4 to Q.6)Imagine a universe in which the four quantum number can have the following values.

$\mathrm{n}=1\mathrm{to}\infty \phantom{\rule{0ex}{0ex}}\mathcal{l}=0\mathrm{to}\mathrm{n}\phantom{\rule{0ex}{0ex}}\mathrm{m}=\u2013\left(\mathcal{l}+1\right)\mathrm{to}+\left(\mathcal{l}+1\right)\mathrm{including}\mathrm{zero}\phantom{\rule{0ex}{0ex}}\mathrm{s}=+\frac{1}{2}\mathrm{and}-\frac{1}{2}$

Answer the following questions based on the above values:

Q4. Total number of elements in the III period of periodic table is :

(a) 8 (b) 20

(c) 30 (d) 15

Q5. If Aufbau $\left(\mathrm{n}+\mathcal{l}\right)$ rule is valid then block of Zn is : [ Atomic number of Zn = 30 ]

(a) s – block (b) p – block

(c) d – block (d)

f– blockwhy the elecronic confrigration of Cu Cr is different (not in trend)

Babu r u here....

what is fluoroscence and phospherence???

do we have any photos of atoms

Q.1 A alpha particle after passing through a potential difference of 2 x 10

^{6}volt falls on a silver foil. The atomic number of silver is 47. Calculate (i) the K.E. of the alpha-particle at the time of falling on the foil. (ii) K.E. of the $\alpha $-particle at a distance of 5 x 10^{-14}m from the nucleus, (iii) the shortest distance from the nucleus of silver to which the $\alpha $-particle reaches.Q.2 A beam of some kind of particle of velocity 2 x 10

^{7}m/s is scattered by a gold (z=79) foil. Find the specific (charge/mass) if the distance of closest approach is 7.9 x 10^{-14}m.Q.3 With what velocity should an $\alpha $-particle travel towards the nucleus of a copper atom so as to arrive at a distance 10

^{-13}meter from the nucleus of the copper atom?Why do we sift electrons for 4s to 3d in some elements like the elements 24 and 29?

ANS:- Data :

z = 2, n= 2, n

^{th}=2^{nd}, v = 2.18 x 10^{6}ms^{-1}, find frequency(f).Now,

n= v/ 2 pie r

n = 2.18 x 10

^{6}ms^{-1}/ 2 x 3.14 x 0. 529 x 10^{-10}mn = [ 2.18 x 10

^{6}/ 2 x 3.14 x 0.529 ] s^{-1}.n = [ 2.18 x 10

^{16}/ 2 x 3.14 x 0.529 ] s^{-1}n = 6.562 x 10

^{15}[fof atom in ground state of hydrogen atom ]Hence,

n = 6.562 x 10

^{15}x 2n = 13.124 x 10

^{5}(Hz) .[ is this correct method ? am i in right direction? ]

WHAT ARE ISOTONES? EXPLAIN WITH EXAMPLES.

Waiting for u....

Q.Find the number of non-axial orbitals occupied by electrons in the configuration of Cu (Z = 29).

Q52. The total number of non-visible lines which can be obtained when an electron returns from 5

^{th }orbit to ground state in H-spectrum is ..................Why do we sift electrons from 4s to 3d in some elements like elements 24 and 29?