OnRamps Unit 1 Part 1 Practice Exam

EMR Ranking and Calculations

What is the correct order of increasing energy?

• Microwaves, visible light, ultraviolet light, x-rays, Gamma-rays

• Microwaves, x-rays, Gamma-rays, visible light, ultraviolet light

• Microwaves, ultraviolet light, visible light, x-rays, gamma-rays

• X-rays, gamma-rays, microwaves, visible light, ultraviolet light

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EMR Ranking and Calculations

If a photon’s wavelength is 663 nm, what is its energy?

• 4.40 x 10^-37 J

• ) 3.00 x 10^-22 J

• 4.40 x 10^-40 J

• 3.00 x 10^-19 J

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Interactions between light and matter

When a given molecule absorbs a photon of infrared (IR) radiation

• It promotes electrons intro delocalized bonding orbitals.

• It begins to vibrate.

• It begins to rotate.

• Its electrons are excited to higher energy levels.

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Failure of Classical Mechanics (Photoelectric effect)

Radiofrequency radiation has what kind of impact on matter?

• It makes the nuclei spin

• It makes the electrons spin

• It makes the molecule rotate

• It makes the nucleus split

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Failure of Classical Mechanics (Photoelectric effect)

Which of the following statement(s) is/are true about the photoelectric effect?

I) The sum of the work function and kinetic energy of an ejected electron is proportional to the frequency of incident light.

II) Given light of high enough intensity, electrons can be ejected from any surface.

III) Einstein employed the concept that photons have quantized amounts of energy to explain the effect.

• I, II

• I, II, III

• I only

• I, III

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Wave particle duality of Light and Matter

The famous electron diffraction pattern is proof of what concept?

• Particles can exhibit wave-like properties

• The location and trajectory of electrons can be found

• Electromagnetic radiation can exhibit wave-like properties

• Electrons can spin when hit by microwave radiation

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De Broglie theory

According to deBroglie, which of the following object has the smallest wavelength?

• electrons

• neutrons

• protons

• molecules

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Rydberg equation calculation

For a Bohr atom, which of the following transitions emits the highest energy photon?

• From n = 10 to n = 8

• From n = 4 to n = 3

• From n = 6 to n = 5

• From n = 2 to n = 1

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Rydberg equation calculation

Which of the following emission lines corresponds to part of the Balmer series of lines in the spectrum of a hydrogen atom?

I) n = 2 --> n = 1

II) n = 4 --> n = 2

III) n = 4 --> n = 1

IV) n = 3 --> n = 2

V) n = 4 --> n = 3

• II and III only

• II and IV only

• V only

• I and III only

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Quantum number applications – H atom

The angular momentum quantum number provides us with information about which characteristic of an electron bound in an atom?

• Orbital energy

• Electron mass

• Orbital shape

• Electron spin