# Electromagnetic Spectrum

## Presentation on theme: "Electromagnetic Spectrum"— Presentation transcript:

Electromagnetic Spectrum

Answer Me!!! What does the sun send to the Earth?

Electromagnetic Waves
All waves in the electromagnetic spectrum travel at the speed of light (3.00 x 108 m/s) Each type of electromagnetic wave is identified by its wavelength (or frequency) The diagram in the reference table demonstrates each of these waves.

Practice Problem 1 The wavelength of a helium nucleus moving with a speed of 2 x 106 m/s is 4.9 x 10-14m. The wavelength of this nucleus is the same order of magnitude as which type of electromagnetic radiation?

Practice Problem 2 In which part of the electromagnetic spectrum would photon B be found? Photon Energy (J) Frequency (Hz) A 6.63 x 10-15 1.00 x 1019 B 1.33 x 10-20 2.00 x 1013

Frequency and Wavelength
Remember for waves: v = fl And the speed of electromagnetic radiation is 3.00 x 108 m/s or the speed of light (c). c = fl

Practice Problem 3 Calculate the wavelength in a vacuum of a radio wave having a frequency of 2.2 x 106 Hz.

Practice Problem 4 A 2.00 x 106 Hz radio signal is sent a distance of 7.30 x 1010 m from Earth to a spaceship orbiting Mars. Approximately how much time does it take the radio signal to travel from Earth to the spaceship?

Answer Me!!! Determine the color of a ray of light with a wavelength of 6.21 x 10-7 m.

Electromagnetic radiation is produced when an electron moves from an excited state to a lower energy state. The higher the electron descends from, the higher the frequency will be.