EMR_Lesson

EMR

By Kurt Hilder

c = fλ

c=3x10⁸ m.s^-1

EMR as a wave

Multiple Choice

As the frequency of an electromagnetic wave increases, the speed of light ____.

• increases.

• decreases.

• stays the same.

EM radiation is classified into types according to the frequency of the wave

THE SPECTRUM

Multiple Choice

Which type of radiation has the SHORTEST wavelength?

• Radio waves

• Ultraviolet Rays

• Gamma Rays

• X-rays

Multiple Choice

Which type of radiation has the Highest Frequency?

• Gamma Rays

• Radio Waves

• Visible Light

• Infrared rays

E = hf

h = 6,63x 10^-34 J.s

Equation

When we look at waves as a particle, we call it a photon.

The energy contained in a photon is directly proportional to its frequency.

Photon

Particle Nature of EMR

Multiple Choice

As the frequency of an electromagnetic wave increases, the amount of energy in that wave...

• increases.

• decreases.

• stays the same.

So all EMR equations

Multiple Choice

What is the energy of an X-ray with a frequency of 1.0 x 10¹⁷ Hz?

• 6.63 x 10^-34 J
• 6.63 x 10^-17 J
• 1.51 x 10¹⁶ J
• 1.51 x 10^-16 J

Multiple Choice

What is the frequency of UV light that has an energy of 2.39 × 10 ^-18 J? 

• 2.32 x 10⁹ Hz
• 3.60 x 10¹⁵ Hz
• 1.58 x 10^-51 Hz
• 3 x 10⁸  m/s

Multiple Choice

What is the energy of light whose wavelength is 4.06 x 10^-11 m? 

• 2.69 x 10^-44 J
• 1.63 x 10^-23 J
• 4.90 x 10^-15 J
• 8.97 x 10^{-53 J}

The electrons surrounding the atomic nucleus are arranged in a series of levels of increasing energy.

Each element has a unique number of electrons in a unique configuration therefore each element has its own distinct set of energy levels.

Emission and absorption spectra

DISCHARGE TUBES

1 eV = 1,6x10^-19 J

Relationship between J and Ev