Electronic Structure.

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Presentation transcript:

Electronic Structure

Wavelength ____________ (λ) - the shortest distance between equal points wave.

Wavelength The wavelength is measured from ____________ or from ____________ . Wavelength is usually expressed in nanometers (1 nm = 1 x 10–9 m). I told you those pesky prefixes would come back to haunt you!!!

Frequency ____________(n) is the number of waves that pass a given point per second. ____________ (Hz), the SI unit of frequency, equals one wave per second (s -1).

Amplitude ____________ - wave’s height from the origin to a ____________ , or from the origin to a ____________ .

Wave Nature of Light All electromagnetic waves, including visible light, travel at a speed of 3.00 x 108 m/s in a vacuum. Speed of light = c.

Wave Nature of Light Although the speed of all electromagnetic waves is the same, waves may have different wavelengths and frequencies. As you can see from the equation, wavelength and frequency are __________ related.

Wave Nature of Light

Electromagnetic Radiation When we say "light," we generally are referring to visible light—a type of electromagnetic radiation. Visible light constitutes a very small segment of the electromagnetic spectrum, which is composed of various types of electromagnetic radiation in order of increasing wavelength. Electromagnetic Spectrum

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Try this one on your own… A laser has a frequency of 4.69 x 10 14 s-1. What is the wavelength?

Energy Matter can gain or lose energy only in small, specific amounts called ____________ .

Energy ____________ (h) has a value of 6.63 x 10–34 J · s J is the symbol for the joule, the SI unit of energy. Don’t forget…frequency must be in hertz

Example A laser has a frequency of 4.69 x 10 14 s-1. How much energy is released?

Try this one… Calculate how much energy that an object can absorb from a light whose wavelength is 589 nm.

De Broglie De Broglie had been thinking that electron orbits had characteristics similar to those of waves. Note: m is the mass and MUST be in Kg, v is the velocity of the particle and MUST be in m/s.

Example What is the wavelength of an electron with a velocity of 5.97 x 10 6 m/s if the mass of an electron in 9.11 x 10 -28 g?

More examples What velocity must a neutron move at for it to exhibit a wavelength of 501 pm if the mass of a neutron is 1.675 x 10 -24 g?

More examples What is the frequency of a green light which has a wavelength of 490 nm?

More examples What is the energy given off from the violet portion of the rainbow if the wavelength is 415 nm?

More examples What is the mass of a particle traveling at 955 m/s with a wavelength of 650 pm?