39 verified questions · ~43 minutes · answer key checked against the official NTA final key across multiple sources. Text-only questions (diagram-based excluded until they can be shown properly).
An electron in a hydrogen atom is in the third excited state. It returns to the ground state by emitting photons. How many different photon wavelengths are possible ?
Match List-I with List-II. List-I (A) Mobility (B) Current density (C) Conductivity (D) Resistivity List-II (I) Ω m (II) A m⁻² (III) Ω⁻¹ m⁻¹ (IV) m² V⁻¹ s⁻¹ Choose the correct answer from the options given below :
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