A beam of monochromatic light is used to excite the electron in Li ++from the first orbit to the third orbit. The wavelength of monochromatic light is found to be x × 10-10 m. The value of x is [Given hc =1242 eV nm ]

Question

A beam of monochromatic light is used to excite the electron in Li ++from the first orbit to the third orbit. The wavelength of monochromatic light is found to be x × 10-10 m. The value of x is [Given hc =1242 eV nm ] (A)  (B)  (C)  (D)

Tardigrade Admin · Accepted Answer

Z=3 (1/λ)=R Z2((1/n12)-(1/n22)) n1=1, n2=3, (1/λ)=R(9)((1/1)-(1/9))=8 R λ=(1/8 R)=114 × 10-10 m

Q. A beam of monochromatic light is used to excite the electron in $L i^{++}$ from the first orbit to the third orbit. The wavelength of monochromatic light is found to be $x \times 1 0^{- 10} m$ . The value of $x$ is ________[Given $h c = 1242 e V nm$ ]

$Z = 3$
$\frac{1}{λ} = R Z^{2} (\frac{1}{n _{1}^{2}} - \frac{1}{n _{2}^{2}})$
$n_{1} = 1, n_{2} = 3$ ,
$\frac{1}{λ} = R (9) (\frac{1}{1} - \frac{1}{9}) = 8 R$
$λ = \frac{1}{8 R} = 114 \times 1 0^{- 10} m$

Q. A beam of monochromatic light is used to excite the electron in Li++from the first orbit to the third orbit. The wavelength of monochromatic light is found to be x×10−10m. The value of x is ________[Given hc=1242eVnm ]

Z=3 λ1​=RZ2(n12​1​−n22​1​) n1​=1,n2​=3, λ1​=R(9)(11​−91​)=8R λ=8R1​=114×10−10m

Q. A beam of monochromatic light is used to excite the electron in $L i^{++}$ from the first orbit to the third orbit. The wavelength of monochromatic light is found to be $x \times 1 0^{- 10} m$ . The value of $x$ is ________[Given $h c = 1242 e V nm$ ]

$Z = 3$
$\frac{1}{λ} = R Z^{2} (\frac{1}{n _{1}^{2}} - \frac{1}{n _{2}^{2}})$
$n_{1} = 1, n_{2} = 3$ ,
$\frac{1}{λ} = R (9) (\frac{1}{1} - \frac{1}{9}) = 8 R$
$λ = \frac{1}{8 R} = 114 \times 1 0^{- 10} m$