Structure of the Atom | SL IB Physics Topic Questions 2025

1

1 mark

Which of the statements is the correct definition of excitation of an electron?

When an electron is removed from or added to an atom
When an electron moves down an energy level emitting a photon
When an electron is given enough energy to move up an energy level, but not enough to leave the atom
When an electron is given enough energy to move up an energy level, and sometimes leave the atom

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1

1 mark

The energy level diagram below shows six possible transitions between the energy levels of an atom. Each transition between levels creates a photon of definite energy and frequency.

7-1-sl-mcq-hard-q1-phy

The increase in frequency is from left to right.

Which of the following spectrum corresponds most closely to the transitions?

7-1-sl-mcq-hard-q1_2-phy

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1

1 mark

According to the Bohr model for hydrogen, visible light is emitted when electrons make transitions from excited states down to the state with n = 2.

The dotted line in the diagram represents such a transition, from n = 3 to n = 2, in the spectrum of hydrogen.

12-1-hl-mcq-medium-q10-diagram

Which of the following diagrams could represent the visible light emission spectrum of hydrogen?

12-1-hl-mcq-medium-q10-real_options

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	Frequency	Wavelength
A.	$f_{3} = f_{1} + f_{2}$	$\frac{1}{λ_{1}} = \frac{1}{λ_{2}} + \frac{1}{λ_{3}}$
B.	$f_{3} = f_{1} - f_{2}$	$\frac{1}{λ_{1}} = \frac{1}{λ_{2}} + \frac{1}{λ_{3}}$
C.	$\frac{1}{f_{1}} = \frac{1}{f_{2}} - \frac{1}{f_{3}}$	$λ_{1} = λ_{2} + λ_{3}$
D.	$\frac{1}{f_{1}} = \frac{1}{f_{2}} + \frac{1}{f_{3}}$	$\frac{1}{λ_{3}} = \frac{1}{λ_{1}} - \frac{1}{λ_{2}}$

	I.	II.
A.	most α-particles miss the gold atoms	a small number of α-particles are deflected by the gold atoms
B.	the nucleus of the gold atom is very small so that most α-particles do not interact with it	the ratio of deflected particles is small because it reflects the ratio of the size of the nucleus compared to the atom
C.	the charge on the nucleus is insufficient to deflect the α-particle	the ratio of deflected particles is small because it reflects the ratio of the size of the nucleus compared to the atom
D.	α-particles are high energy and able to pass through the nucleus	the charges on the α-particle and the nucleus are such that large angle deflection cannot occur

Structure of the Atom (SL IB Physics)

Topic Questions