Wavelength, Energy Frequency Calculations Photoelectric Effect

Lesson Sequence Evaluate: Warm-Up Explain: Energy, Wavelength, Frequency Calculations Elaborate: Calculation Practice Evaluate: Exit Ticket

Warm-Up

Objective Today I will be able to: Correctly calculate the wavelength, energy and frequency of light emitted from an atom.

Homework Wear closed toe shoes tomorrow Electrons Quiz – Wednesday, October 29 STEM Fair Conclusion Due November 14

Agenda Warm-Up Calculation Notes Calculation Practice Flame Test Lab Introduction Exit Ticket

Energy, Wavelength, Frequency Calculation Notes

Electromagnetic Spectrum

Calculating Wavelength and Frequency C= 3.0 x 108 m/s (speed of light) λ = wavelength (meters) ν = frequency (Hertz or 1/seconds)

Calculating Energy and Frequency Planck came up with the equation E= hν E = Energy (Joules) h = Planck’s Constant 6.626 x 10-34 J*s ν = frequency (Hertz or 1/seconds)

Absorption of Energy Photoelectric Effect Electrons are emitted from solids, liquids or gases when they absorb energy from light.

Calculation Examples

Energy, Wavelength, Frequency Practice Complete the practice at your desk. Ask Ms. Ose for help if you have questions.

Flame Test Lab Introduction

Flame Test Lab Safety Must wear goggles, aprons, closed toe shoes, tie long hair back, no baggy clothing 9 stations that you will rotate through Must follow Ms. Ose’s instructions When directed you will Move to the station Turn on the gas and light the Bunsen burner Ms. Ose will turn out the lights You will place 1 wooden splint soaked in a metallic salt in the flame and observe the color change Ms. Ose will turn the lights on You will record your observations on your worksheet When Ms. Ose says so, you will rotate Failure to follow the directions or any horseplay will result in removal from the lab.

Exit Ticket What will I do to be safe and successful in lab tomorrow?