Chem

Electromagnetic radiation (EMR) Is what?

• form of wave energy that includes visible light, x-rays, microwaves, gamma rays, etc.

  
  

• Form of a particle that includes visible light, x-rays, microwaves, gamma rays, etc.

• Form of light includes visible light, x-rays, microwaves, gamma rays, etc.

Wavelength

• distance required for one complete cycle of wave to occur   
  (usually in joules)

  
  

• distance required for two complete cycle of wave to occur   
  (usually in meters)

  
  

• distance required for one complete cycle of wave to occur   
  (usually in meters)

  
  

FrequencyI

•  the number of complete wave cycles that pass a fixed point in a given time period   (usually in waves/sec  →  Hertz (Hz)  = 1/s )

  
  

• Inversely proportional to wave length

• the number of incomplete wave cycles that pass a fixed point in a given time period

   c =

• hxf

• 3.00x10^6

• 6.02 x10^23

• speed of light = 3.00 x 10 ^8 m/s

Different frequencies=

   c = f x λ          3.00 x 108 m/s = f x (3.0 x 10-6 m)

      f = 3.00 x 108 m/s ÷  3.0 x 10-6 m =

Are they finding frequncy or wavelength

• Wavelength

• Frequency

c = f x λ          3.00 x 108 m/s = (2.5 x 108 Hz) x  λ

    λ = 3.00 x 108 m/s ÷ 2.5 x 108 Hz =

Are they finding frequency or wavelength 1.2m

• Wavelength

• Freqeuncy

atomic emission spectrum

• Every element produces a unique spectral pattern

• Every element has the same color

• elements don't have colors

photoelectric effect

• • Light (as a wave) should not be displacing matter (an electron) from a metal plate

• • Light (as a wave) should be displacing matter (an electron) from a metal plate

Key concept#1: Energy is quantified : Max planck

• matter can only gain or lose energy in small specific amounts called quanta.    (Energy can’t be continuously divided.

• matter can only gain energy in specific amounts called quanta.    (Energy can be continuously divided.