Emission transitions in the Paschen series end at orbit n = 3 and start from orbit n and can be represented as `v = 3.29 xx 10^(15) (Hz) [1//3^(2) - 1//n^(2)]` Calculate the value of n if the transition is observed at 1285 nm. Find the region of the spectrum.

Emission transitions in the Paschen series end at orbit n = 3 and star

1.	Emission transitions in the Paschen series end at orbit n = 3 and start from orbit n and can be represented as `v = 3.29 xx 10^(15) (Hz) [1//3^(2) - 1//n^(2)]` Calculate the value of n if the transition is observed at 1285 nm. Find the region of the spectrum.
Answer» `v = (c)/(lamda) = (3.0 xx 10^(8) ms^(-1))/(1285 xx 10^(-9) m) = 3.29 xx 10^(15) ((1)/(3^(2)) - (1)/(n^(2)))` or `(1)/(n^(2)) = (1)/(9) - (3.0 xx 10^(8) ms^(-1))/(1285 xx 10^(-9) m) xx (1)/(3.29 xx 10^(15)) = 0.111 - 0.071 = 0.04 = (1)/(25) or n^(2) = 25 or n = 5` The radiation corresponding to 1285 nm lies int eh infrared region.

Discussion

No Comment Found

Related InterviewSolutions

Which of the four quantum number (n, l, `m_(l), m_(s)`) determine (a) the energy of an electron in a hydrogen atom and in a many electron atom (b) the size of an orbital (c) the shape of an orbital (d) the orientation of an orbital in space ?
Which of the following sate of quantum numbers is not permissible for an electron in an atom? (i) `n = 1,l = 1, m_(l) 0, m_(s) =+ 1//2` (ii) `n = 3, l = 1, m_(1) =- 2, m_(s) =- 1//2` (iii) `n =1, l = 1, m_(l) = 0, m_(s) =+ 1//2` (iv) `n = 2, l = 0, m_(l) = 0, m_(s) = 1`A. `(i),(ii),(iii),(iv)`B. `(ii),(iii),(iv)`C. `(i),(ii),(iv)`D. `(i),(iii),(iv)`
Four set ups as given here were arranged to identify the gas evolved when dilute sulphuric acid was added to zinc granules. The most appropriate set up is : A. IB. IIC. IIID. IV
A compound of vanadium has a magnetic moment of `1.73BM`. Work out the electronic configuration of vanadium in the compound
Name the element in each of the following cases: (i) A bivalent anion of the element having 10 electrons (ii) A trivalent cation of the element having 10 electrons. What is the relationship between the two ions called ?
If the position of the electron is measured within an accuracy of `+- 0.002 nm`. Calculate the uncertainty in the momentum of the electron. Suppose the momentum of the electron is `h//4pi_(m)xx0.05 nm`, is there any problem in defining this value.
The mass of an electron is `9.1 xx 10^(-31) kg`. If its K.E. is `3.0 xx 10^(-25)J`, calculate its wavelength
The kinetic energy of an electron is `4.55 xx 10^(-25)J`. The mass of electron is ` 9.1 xx 10^(-31)kg`. Calculate velocity, momentum and wavelength of the electron.
Calculate the wavelength associated with an electron (mass `9.1 xx 10^(-31)kg`) moving with a velocity of `10^(3) m sec^(-1) (h = 6.6 xx 10^(-34) kg m^(2) sec^(-1))`
What must be the velocity of a beam of electrons if they are to disply a de Broglie wavelength of `100 Å` (mass of electron `= 9.1 xx 10^(-31) kg, h = 6.6 xx 10^(-34) J s`)?

Emission transitions in the Paschen series end at orbit n = 3 and start from orbit n and can be represented as `v = 3.29 xx 10^(15) (Hz) [1//3^(2) - 1//n^(2)]` Calculate the value of n if the transition is observed at 1285 nm. Find the region of the spectrum.

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment