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Calculate the energy of the hydrogen atom in the states n = 4 and n = 2. Determine the frequency and wavelength of the emitted radiation in a transiti

Monjur Alahi

Calculate the energy of the hydrogen atom in the states n = 4 and n = 2. Determine the frequency and wavelength of the emitted radiation in a transition from n = 4 to n=2 state. Is this radiation visible?


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Salim Ahmed Kawsar

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Correct Answer - `0.85 eV, 3.4 eV, 6.16 xx 10^(14) Hz, 4.87 xx 10^(-7)m`; yes

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The threshold frequency `v_(0)` for a metal is `6xx10^(14) s^(-1)`. Calculate the kinetic energy of an electron emitted when radiation of frequency `v

`K.E.=1/2 m_(e)V^(2)=h(v-v_(0))` `:. K.E.=(6.626xx10^(-34))(1.1xx10^(15)-6xx10^(14))` `:. K.E.=(6.626xx10^(-34))(5xx10^(14))` `=3.313xx10^(-19) J`

2 Answers 2 views
If a light with frequency `4xx10^(16) Hz` emitted photoelectrons with double the maximum kinetic as are emitted by the light of frequency `2.5xx10^(16

Correct Answer - `1xx10^(16) Hz` For frequency `2.5xx10^(16) Hz, h v=hv_(o)+KE_(max)` `:. h(2.5xx10^(16))=hv_(o)+KE_(max) ...(i)` For frequency `4xx10^(16)` Hz, `h(4xx10^(16))=hv_(o)+2KE_(max) ...(2)` Multiply `eq^(n)` (1) by `2` and substract `eq^(n)` (2) from it....

2 Answers 1 views
Calculate the frequency of light emitted in an electron transition from the sixth to the second orbit of a hydrogen atom. In what region of the spectu

Correct Answer - `v=7.3xx10^(14) Hz`, visible spectrum `DeltaE_(6 to 2)=hv rArr v=(3.022xx1.6xx10^(-19))/(6.625xx10^(-34))=7.3xx10^(14) Hz` This frequency lies in visible spectrum.

2 Answers 1 views
Hydrogen atoms in very high quantum state have been observed in radio astronomy. The wavelength of radiation emitted when hydrogen atom makes transiti

Correct Answer - `5.8 cm`

2 Answers 1 views
A hydrogen atom in ground state is moving with a kinetic energy of 30 eV. It collides with a deuterium atom in ground state at rest. The hydrogen atom

Correct Answer - `20 eV, 13.2 eV`

2 Answers 1 views
The energy of photoelectrons emitted from a sensitive plate is 1.56 eV. If its threshold old wavelength is `2500 Å`, calculate the wavelength of incid

Correct Answer - `1379 Å`

2 Answers 1 views
The bank gap of an alloy semiconductor galiumarseide phosphie is `1.98eV`. Calculate the wavelength of radiation that is emitted when electrons and ho

Correct Answer - `6250Å,` red

2 Answers 1 views
By giving energy to a hydrogen atom in energy state n=1. If the potential energy of the atom in n=1 state be `-13.6 eV`, calculate (a) potential enreg

Correct Answer - `-0.85 eV, 12.75 eV, 971 Å`

2 Answers 1 views
A hydrogen atom in ground state absorbs a photon of ultraviolet radiation of wavelength `50 nm` Assuming that the entire photon energy is taken up by

Correct Answer - `[11.2eV]`

2 Answers 1 views
An electron in an excited hydrogen atom acquired an energy of 12.1 eV. To what energy level did it jump? How many spectral lines may be emitted in the

Correct Answer - `n=3;` 1025 Å, 6563 Å; 1215 Å

2 Answers 1 views

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