JEE Main 2018 (Online) 15th April Morning Slot | Structure of Atom Question 160 | Chemistry

Ejection of the photoelectron from metal in the photoelectric experiment can be stopped by applying 0.5 V when the radiation of 250 nm is used. The work function of the metal is :

4 eV

4.5 eV

5 eV

5.5 eV

JEE Main 2017 (Online) 9th April Morning Slot

MCQ (Single Correct Answer)

-1

The electron in the hydrogen atom undergoes transition from higher orbitals to orbital of radius 211.6 pm. This transition is associated with :

Lyman series

Balmer series

Paschen series

Brackett series

JEE Main 2017 (Online) 8th April Morning Slot

MCQ (Single Correct Answer)

-1

If the shortest wavelength in Lyman series of hydrogen atom is A, then the longest wavelength in Paschen series of He⁺ is :

$${{5A} \over 9}$$

$${{9A} \over 5}$$

$${{36A} \over 5}$$

$${{36A} \over 7}$$

JEE Main 2017 (Offline)

MCQ (Single Correct Answer)

-1

The group having isoelectronic species is:

O^2- , F^- , Na⁺, Mg²⁺

O^2- , F^- , Na, Mg²⁺

O^- , F^- , Na⁺, Mg²⁺

O^- , F^- , Na, Mg⁺

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