Answers to this weeks quiz are as follows:
1. A frequency of 2.45 gigahertz has what wavelength in meters?
(2.45 gigahertz = 2.45 x 10^9 Hertz) c = wavelength x frequency, wavelength = c/f
= .122 m
2. Which color in the visible spectrum has the highest frequency? = violet
3. Which color in the visible spectrum has the highest wavelength = red
4. Which is longer the wavelength of a microwave or a radio wave? = radio
5. what is the speed of all electromagnetic radiation? = 3.00 x 10^8 m/s
Next we are going to be talking briefly on quantum mechanics and how it relates to chemistry. We have already talked about how electrons and light both exhibit particle-wave duality. They both can act like a wave or a particle, in certain circumstances.
This man is Louis Victor de Broglie and he proposed that a free electron (not attached to any atom) with a mass m moving with a velocity v, should have an associated wavelength. His equation, wavelength = h/mv is very usefull in many chemistry problems. The h in this equation is a constant, called Planck's constant, and is named after Max Planck. It's value is 6.626 x 10^-34 J/sec. Remember that light and electrons behave like particles and waves, but not simultaneously. In a given situation, they will behave like either a particle or a wave. We will talk more about the de Broglie equation and wave-particle duality this week.
For Parents:
Wednesday is the big day! Field trip day! We are planning to see and do everything and we should have a lot of fun. Make sure your child arrives to school on time on Wednesday as we will leave promptly at 8:30 am. Also, be sure your child has a bagged lunch. Thanks for all your help!
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