Question

how many frequencies of radiation can be observed when an electron transists from 4th energy level?what is the wavelength of the longest wavelength of such radiation?​

Answer 1

Answer:

7 frequent radiation

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Answer 2

$\huge\sf\fbox\purple{ ♡ Solution ♡ }$

★ Explanation ★

Correct option is 3.08×1015s−1

The frequency of radiation emitted when the electron falls from n=4 to n=1 in a hydrogen atom will be 3.08×1015s−1

I.E = −E1 = 2.18 × 10−18J/atom

E1 = −I.E = −2.18 × 10−18J/atom

En = n2E1

E4 = 42E1

E4 = 42−2.18 × 10−18J/atom

E4 = −1.36 × 10− 19J/atom

ΔE =E1 − E4

ΔE = −2.18 × 10−18J/atom−(−1.36×10−19J/atom)

ΔE = −2.04 × 10 − 18J/atom

The frequency ν = hΔE

ν = 6.626×10 − 34Js2.04 × 10 − 18J/atom

ν = 3.08×1015s − 1