Catalyst Catalyst Questions Alpha decay is blocked by _____, beta is blocked by ____, and gamma is...

Catalyst Catalyst

Catalyst QuestionsCatalyst Questions Alpha decay is blocked by _____,

beta is blocked by ____, and gamma is blocked by ____.

Alpha decay is blocked by _____, beta is blocked by ____, and gamma is blocked by ____.

To Do & Homework To Do & Homework Update your Table of Contents

Homework: None

Update your Table of Contents

Homework: None

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Unit 2: Atomic Theory and Periodic Table14 4 Square Graphic Organizer Electronegativity 15 4 Square: Video Clips Nuclear Fission and Fusion16 Practice Q’s Radioactive Decay17 Radiation Investigation Notes: EM Radiation

1. Black hole 2. Light bulb 3. X-ray of hand 4. Infrared picture of a cat 5. Microwave oven 6. AM/FM radio

Sequence the cards using logic, and write down your rationale for the chosen order on 17L.

Be prepared to share out.

How are the images related?

What do radios, microwaves, and X rays have in common?

Name the 7 types of EM radiation Do gamma rays have short or long wavelengths The Fermi telescope allows us to see what? Define electromagnetic spectrum.

Electromagnetic Waves

What do radios, microwaves, and X rays have in common?

Name the 7 types of EM radiation Do gamma rays have short or long wavelengths The Fermi telescope allows us to see what? Define electromagnetic spectrum.

Using the given EM Wave for your group, you will individually answer the questions from the investigation table

Challenge: find an example of something that is relatively the same size as one wavelength of that EM Wave.

Is one wavelength the size of a cell? Of a truck? Building?

Putting together the EM Spectrum Each person from each group will each have a different

key piece of information on an index card or sticky note and place on the big roll of butcher paper for your class period.

We have constructed our own EM Spectrum using what YOU found. Now let me explain everything.

Electromagnetic Spectrum (17R)• Is the name for the range of EM waves when

placed in order of increasing frequency. • Spectrum ranges from radio to gamma rays

Characteristics of EM Waves• ALL types have the same speed; the speed of light• But each EM wave has a unique wavelength and

unique frequency. • EM waves transfer energy in the form of EM

radiation.

Frequency (): the number of wave peaks per second, measured in hertz (Hz)

Wavelength (): the distance between two peaks of a wave, measured in nanometers (nm).

Reflection on back of catalyst

• Write 3 takeaways from today’s investigation. • What do you think makes a microwave

different from a gamma ray?

Catalyst Catalyst

Catalyst QuestionsCatalyst Questions Contrast wavelength and

frequency. Use a picture to illustrate these two concepts.

Contrast wavelength and

frequency. Use a picture to illustrate these two concepts.

To Do & Homework To Do & Homework Update your Table of Contents

Homework: None

Update your Table of Contents

Homework: None

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Unit 2: Atomic Theory and Periodic Table14 4 Square Graphic Organizer Electronegativity 15 4 Square: Video Clips Nuclear Fission and Fusion16 Practice Q’s Radioactive Decay17 Radiation Investigation Notes: EM Radiation18 Practice Notes: Wave Calcuations

The following equation relates frequency and wavelength to the speed of light:

c =

•c is the speed of light (3 x 108 m/s)• is the wavelength (meters)• is frequency (s-1 or Hz)

Example 1: Find the wavelength of a light with a frequency of 2.5 x 1014 Hz.

Example 2: Find the wavelength of a light with a frequency of 5.0 x 1014 Hz.

Honors Example 3: Find the frequency of a light with a wavelength 300 nm.

Example 3: Find the frequency of a light with a wavelength 3 x 10 -7 meters.

Honors Example 4: Find the frequency of a light with a wavelength 200 nm.

Example 4: Find the frequency of a light with a wavelength 2 x 10-7 meters

• Plank stated that energy is emitted (released) in discrete units (“Packets”) called quanta.

• This stream of light in “packets” is also known as the photon.

The energy of a photon varies with the frequency of the radiation according to the equation:

E = h

E = Energy in joules = Frequency (s-1 or Hz)h = Planck’s constant (6.6 x 10-34 J/Hz)

Example 5: What is the energy of a light with a frequency of 3.5 x 1014 Hz?

Example 6: What is the energy of a light with a frequency of 7.2 x 1014 Hz?

Example 7: What is the energy of a light with a frequency of 2.9 x 1014 Hz?

Honors Example 8: Find the energy of a photon of light with a wavelength of 450 nm.

Example 8: Find the energy of a photon of light with a wavelength of 4.5x10-7 m.

Catalyst Catalyst

Catalyst QuestionsCatalyst Questions Find the frequency of a light with

a wavelength 2 x 10-7 meters

Find the frequency of a light with

a wavelength 2 x 10-7 meters

To Do & Homework To Do & Homework Update your Table of Contents

Homework: None

Update your Table of Contents

Homework: None

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Unit 2: Atomic Theory and Periodic Table14 4 Square Graphic Organizer Electronegativity 15 4 Square: Video Clips Nuclear Fission and Fusion16 Practice Q’s Radioactive Decay17 Radiation Investigation Notes: EM Radiation18 Practice/EM Wave Calculations Notes: Wave Calcuations19 Simulation EM Radiation Webquest

Important Discovering about the Atom

• Heisenberg found that it is impossible to know both the exact position and momentum (velocity) of an electron at the same time.

• Werner Heisenberg …..won the the Nobel Prize for this.

• Erwin Schrodinger calculated the “probability” of finding an electron in an atom. This disproved the Bohr Model of the atom.

• Electrons DON’T orbit the nucleus in orbits instead they are found in regions called electron clouds or orbitals.

• Atoms absorb and release energy in the form of photons or light energy.

• Neils Bohr found that an electron has qualities of both a particle and a wave. When measuring an electron’s position, it is found as a particle in space. But when you measure its velocity or momentum, it is treated as a wave.

Agenda Off task behavior will result in a detention.

All must be finished by the end of today.

Rounding however you want is okay.

6.67 = 6.7 = 7 (all are okay)

My answers are in sicentific notation, yours don’t have to be.