9. Quantum Mechanics

Speed of Light

history of the speed of light and how its speed was determined

How Fast the Light Speed  from Nasa

When they are burned, certain elements emit light at a specific wavelength. Some wavelengths for certain elements are provided below:<img src="https://static.studychannel.pearsonprd.tech/courses/general-chemistry/thumbnails/images/13af347a"class="fr-fic fr-dii">When burned, an unknown element emits light at a frequency of 9.23 x 1014 s-1. What is the identity of this unknown element?

The distance from Earth to the sun is 1.5 * 108 km. Find the
number of crests in a light wave of frequency 1.0 * 1014 s - 1
traveling from the sun to Earth.

In an experiment to study the photoelectric effect, a scientist
measures the kinetic energy of ejected electrons as a function of
the frequency of radiation hitting a metal surface. She obtains
the following plot. The point labeled “n0” corresponds to light
with a wavelength of 542 nm. (a) What is the value of n0 in s - 1?
<img src="https://lightcat-files.s3.amazonaws.com/problem_images/7635dcce2368bc41-1664382871574.jpg" alt="" />

A laser pointer used in a lecture hall emits light at 650 nm.
What is the frequency of this radiation?

(d) What distance does electromagnetic radiation travel in 0.38 ps?

Moseley established the concept of atomic number by studying 
X rays emitted by the elements. The X rays emitted by 
some of the elements have the following wavelengths: 
Element Wavelength (pm) 
Ne 1461 
Ca 335.8 
Zn 143.5 
Zr 78.6 
Sn 49.1 
(d) Use the result from part (b) to predict the X-ray wavelength 
emitted by iron.

Speed of Light Example 1

Why is the speed of light what it is? Maxwell equations visualized

The speed of light explained  in 3 minutes

Consider the two waves shown here, which we will consider
to represent two electromagnetic radiations:
(b) What is the frequency of wave A?
<img src="https://lightcat-files.s3.amazonaws.com/problem_images/d0c108eb1c404ff1-1660757573945.jpg" alt="" />

(a) What is the frequency of radiation that has a wavelength
of 10 mm, about the size of a bacterium?

The speed of sound in air is 344 m>s at room temperature. The 
lowest frequency of a large organ pipe is 30 s - 1 and the highest
frequency of a piccolo is 1.5 * 104 s - 1. Find the difference in 
wavelength between these two sounds.

Light Speed, Wavelength, and Frequency | Dimensional Analysis | Doc Physics

The speed of sound in dry air at 20 °C is 343 m/s and the lowest
frequency sound wave that the human ear can detect is approximately 20 Hz. (a) What is the wavelength of such a sound
wave?

The distance between the earth and the sun is 1.496 x 1017 μm. How long (in mins) will it take for light to go from the sun to earth?

(b) Fiber optic cable is available in 12 km lengths. How long will it take for a signal to travel that distance assuming that the speed of light in the cable is the same as in a vacuum?

A popular kitchen appliance produces electromagnetic radiation
with a frequency of 2450 MHz. With reference to Figure
6.4, answer the following: (a) Estimate the wavelength
of this radiation.

What is the frequency of a microwave with l = 4.33 * 10-3 m?

How Fast Is Light?

Even the music we listen to deals with how energy travels to get to our car radio. If an FM Radio station broadcasts its music at 97.7 MHz find the wavelength in angstroms of the radio waves. One angstrom is equal to 10-10 m.

Why Is The Speed Of Light The Speed Of Light? | Answers With Joe

Moseley established the concept of atomic number by studying 
X rays emitted by the elements. The X rays emitted by 
some of the elements have the following wavelengths: 
Element Wavelength (pm) 
Ne 1461 
Ca 335.8 
Zn 143.5 
Zr 78.6 
Sn 49.1 
(e) A particular element emits X rays with a 
wavelength of 98.0 pm. What element do you think it is?

Certain elements emit light of a specific wavelength when 
they are burned or heated in a non-luminous flame. Historically, 
chemists used such emission wavelengths to determine 
whether specific elements were present in a sample. Some 
characteristic wavelengths for a few of the elements are given 
in the following table: 
Ag 328.1 nm Fe 372.0 nm 
Au 267.6 nm K 404.7 nm 
Ba 455.4 nm Mg 285.2 nm 
Ca 422.7 nm Na 589.6 nm 
Cu 324.8 nm Ni 341.5 nm 
(c) When 
burned, a sample of an unknown substance is found to emit 
light of frequency 6.58 * 1014 s-1. Which of these elements is 
probably in the sample?

(a) A green laser pointer emits light with a wavelength of 
532 nm. What is the frequency of this light?

The distance from the sun to Earth is 1.496 * 108 km. How
long does it take light to travel from the sun to Earth?

Moseley established the concept of atomic number by studying
X rays emitted by the elements. The X rays emitted by
some of the elements have the following wavelengths:
Element Wavelength (pm)
Ne 1461
Ca 335.8
Zn 143.5
Zr 78.6
Sn 49.1
(a) Calculate the frequency, n, of the X rays emitted by each
of the elements, in Hz.

Calculate the frequency of each wavelength of electromagnetic
radiation:
a. 632.8 nm (wavelength of red light from helium–neon laser)
b. 503 nm (wavelength of maximum solar radiation)
c. 0.052 nm (wavelength contained in medical X-rays)

A certain cellular telephone transmits at a frequency of 825 MHz and receives at a frequency of 875 MHz.
(a) What is the wavelength of the transmitted signal in cm?

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1. Intro to General Chemistry

2. Atoms & Elements

3. Chemical Reactions

4. BONUS: Lab Techniques and Procedures

5. BONUS: Mathematical Operations and Functions

6. Chemical Quantities & Aqueous Reactions

7. Gases

8. Thermochemistry

10. Periodic Properties of the Elements

11. Bonding & Molecular Structure

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13. Liquids, Solids & Intermolecular Forces

14. Solutions

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17. Acid and Base Equilibrium

18. Aqueous Equilibrium

19. Chemical Thermodynamics

20. Electrochemistry

21. Nuclear Chemistry

22. Organic Chemistry

23. Chemistry of the Nonmetals

24. Transition Metals and Coordination Compounds

[BOOK CHEM] Clutch Version

Wavelength and Frequency

Wavelength&nbsp;is the distance from one crest of a wave to another, whereas frequency is the number of waves within a second.&nbsp;

Quantum Numbers: Spin Quantum Number

The Spin Quantum Number deals with the spin of an electron within an orbital.

The Speed of Light in a vacuum is related to the wavelength and frequency of a light particle.

Bohr Equation

In the Bohr Equation, the energy and wavelength a photon is related to its energy shell transitions.

Quantum Numbers: Angular Momentum Quantum Number

The&nbsp;Angular Momentum Quantum Number&nbsp;gives the shape of the atomic orbitals.

Emission Spectrum

Emission Spectra is a series of lines formed when emitted light is focused by a slit and passed through a prism. &nbsp;

Introduction to Quantum Mechanics

The 4 Quantum Numbers provide us the coordinates to find the theoretical location of an electron.

Quantum Numbers: Nodes

A node is the region in an atom with zero electron density and where an electron is least likely to exist.

The Energy of Light

The Energy of Light&nbsp;involves the use of a new variable Planck's Constant.

Electromagnetic Spectrum

The Electromagnetic Spectrum is the different forms of radioactive energy that exists in our universe.

Heisenberg Uncertainty Principle

Heisenberg's Uncertainty Principle&nbsp;tries to explain the potential duality of an electron behaving as either a particle or wave.&nbsp;

Quantum Numbers: Number of Electrons

The Quantum Numbers can give both the quantity and location of electrons within a given atom.&nbsp;

Quantum Numbers: Principal Quantum Number

The Principal Quantum Number gives both the size and energy of an electron shell.&nbsp;

Photoelectric Effect

What happens when light strikes the surface of a metal? The Photoelectric Effect&nbsp;can help to explain that.&nbsp;

Quantum Numbers: Magnetic Quantum Number

The Magnetic Quantum Number gives the location of an electron within a specific orbital.

Bohr Model

In the Bohr Model, electrons can move up and down to different orbitals or shells based on absorbing or releasing of energy.&nbsp;

De Broglie Wavelength

The&nbsp;De Broglie Wavelength equation relates wavelength to velocity or speed.&nbsp;

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