Atomic Models & Spectra

Bohr ideas and hydrogen-like atom basics. Ideal for students preparing board exams and competitive tests.

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QUESTION NO 01

Planck's constant h has units of?

Answer: J·s

h ≈ 6.626 × 10⁻³⁴ J·s (action).

Shahzad Mahota @shahzad-mahota

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QUESTION NO 02

Work function is the?

Answer: Minimum energy to eject an electron from a metal

φ is the threshold energy to free an electron from the surface.

Shahzad Mahota @shahzad-mahota

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QUESTION NO 03

de Broglie wavelength of a particle is?

Answer: h/p

λ = h/p for matter waves.

Shahzad Mahota @shahzad-mahota

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QUESTION NO 04

Bohr model successfully explained spectra of?

Answer: Hydrogen-like atoms

Bohr's model works well for hydrogen-like (one-electron) systems.

Shahzad Mahota @shahzad-mahota

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QUESTION NO 05

Atomic number Z equals number of?

Answer: Protons in the nucleus

Z = number of protons (defines the element).

Shahzad Mahota @shahzad-mahota

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QUESTION NO 06

Isotopes have same?

Answer: Atomic number but different mass number

Isotopes: same Z, different N (hence different A).

Shahzad Mahota @shahzad-mahota

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QUESTION NO 07

Radioactivity is?

Answer: Spontaneous nuclear decay

Radioactive decay is spontaneous transformation of unstable nuclei.

Shahzad Mahota @shahzad-mahota

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QUESTION NO 08

Alpha particle is?

Answer: Helium nucleus (2p+2n)

α = ⁴He nucleus.

Shahzad Mahota @shahzad-mahota

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QUESTION NO 09

Beta-minus particle is?

Answer: Electron

β⁻ emission sends out an electron (and antineutrino).

Shahzad Mahota @shahzad-mahota

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QUESTION NO 10

Gamma rays are?

Answer: High-energy photons

γ radiation is electromagnetic radiation from nuclei.

Shahzad Mahota @shahzad-mahota

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Shahzad Mahota

@shahzad-mahota

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Atomic Models & Spectra

Planck's constant h has units of?

Work function is the?

de Broglie wavelength of a particle is?

Bohr model successfully explained spectra of?

Atomic number Z equals number of?

Isotopes have same?

Radioactivity is?

Alpha particle is?

Beta-minus particle is?

Gamma rays are?

Published By

Shahzad Mahota

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00

00

00

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Atomic Models & Spectra

Planck's constant h has units of?

Explanation

Work function is the?

Explanation

de Broglie wavelength of a particle is?

Explanation

Bohr model successfully explained spectra of?

Explanation

Atomic number Z equals number of?

Explanation

Isotopes have same?

Explanation

Radioactivity is?

Explanation

Alpha particle is?

Explanation

Beta-minus particle is?

Explanation

Gamma rays are?

Explanation

Published By

Shahzad Mahota

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00

00

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