# Physics Ch 9 Class 12 Atomic Spectra

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Energy of the 4th orbit in a hydrogen atom is:

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Atomic Spectra
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The wavenumber of a photon in Brackett series is 9/400 R then electron transited from orbit with the quantum number:

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If an electron undergoes transition from 4th to 2nd orbit, then the color of radiations produced will be:

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Which of the following statements is not consistent with Bohr’s set of postulates regarding the hydrogen atom model with regard to the emission and absorption of light?

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Energy difference in balmer series for longest wavelength is

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A hydrogen atom in its ground state absorbs 10.2 eV of energy. What is the orbital angular momentum is increased by?

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The ratio of wavelength of last line of Balmer series and last line of lymen series is

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The velocity of X rays is equal to that of:

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A particle of mass 5 mg moves with a speed of 8 m/s. Calculate its de Broglie wavelength (h = 6.63 x 10-34 Js)

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Spectral lines is like a __________ of absorbed or emission energy in a spectrum.

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A star moving away from earth shows?

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X-rays are also known as:

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A nucleus consists of 19 protons and 20 neutrons. The conventional symbol of this nucleus is:

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In hydrogen spectrum If nj = 6, then the spectral lines lie In:

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Calculate the energy of a photon of wavelength 6600 angstroms.

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If the wavelength of K X-ray from Cu is 1.337 x 10-10m, then the energy difference between two levels from which transition results will be:

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The anti-particle of quark is _________.

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If a proton, alpha particle, and photon moving with the same velocity enter a uniform magnetic field, then which particle will deflect more?

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The ionization energy of hydrogen is:

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When describing the isotopes of the same element, the most accurate statement is that they have:

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If an electron jumps from 68′ orbit to 7 orbit, the increase in radius will be:

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Which series is emitted when electron Jumps from a higher orbit to fifth orbit?

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An atom would be neutral if it has equal number of:

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When an electron jumps from outer to 5th orbit, then the spectral lines fall into region.

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The number of protons in the nucleus is called _____ number.

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For the first time in 1914, Henry Moseley used X-rays for the determination of:

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Transition of electrons should occur between which orbitals(n) that will emit the longest wavelength in the Balmer series of Hydrogen.

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The down quark has charge ________.

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Which of the following is different for isotopes?

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Radiations emitted by human body lie in which of the following series?

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Total energy of an electron in hydrogen atom when it Jumps to higher orbit from a lower orbit Is

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The target in the X ray unit is given a:

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The nucleus shape is considered to be:

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For gaining an atomic spectra, an evacuated glass tube is filled with:

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X rays are affected by:

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Find the longest wavelength in the Paschen series, given R = 1.097 x 107m-1.

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In hydrogen spectrum, Lyman and Balmer series belong to which region?

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The formula for the Paschen series for the Hydrogen spectrum is _______.

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X rays are similar in nature to:

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The ratio of mass of electron to neutron is:

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The shortest wavelength photon emitted in Balmer series is:

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According to Bohr’s theory of Hydrogen atom, only those atomic orbits with radii ‘r’ and atomic shell ‘n’ around the nucleus are allowed which have the angular moments:

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_____ are such nuclei of an element that have the same mass number A, but have different charge number Z.

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The atomic spectra deals with the measurement of?

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An electron cannot reside inside a nucleus is explained by:

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The penetrating power of X rays increases with:

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The first excitation energy of H atom will be:

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Spectra corresponding to the sodium vapour lamp is:

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Electrons are emitted in the production of X rays by:

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During the production of x-rays, the cathode and anode are enclosed inside an evacuated glass chamber and a high DC voltage of the order of:

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________ are very high energy electromagnetic radiations of the extremely short wavelength emitted from the nuclei of radioactive atoms originating from the high energy transitions of the nucleons in the nuclei.

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