The electromagnetic spectrum is the range of all types of electromagnetic radiation, which includes radio waves, microwaves, infrared, visible light, ultraviolet, X-rays and gamma rays. Visible light oscillates between 400-790 terahertz and has wavelengths around 390-750 nanometers that our eyes can detect as different colors. The entire electromagnetic spectrum ranges from long wavelength, low frequency radio waves to short wavelength, high frequency gamma rays. Astronomers use the full electromagnetic spectrum to observe different phenomena in space, such as using radio waves to map the structure of the galaxy and microwaves to detect the remnant glow of the Big Bang.

1. ELECTROMAGNETIC
SPECTRUM
PREPARED BY: JOSEPHINE L. SISON
BSED IV MATH

2. The electromagnetic (EM) spectrum is the range
of radiation. All types of EM Radiation is energy
that travels and spreads out as it goes –
the visible light that comes from a lamp in your
house and the radio waves that come from a
radio station are two types of electromagnetic
radiation.
ELECTRAOMGNETIC
SPECTRUM

3. The image shows
where you might
encounter each
portion of
the electromagnetic
spectrum in your
day-to-day life.

4. The electromagnetic waves your eyes detect – visible light –
oscillates between 400 and 790 terahertz (THz). That’s several
hundred trillion times a second. The wavelengths are roughly the
size of a large virus: 390 – 750 nanometers (1 nanometer = 1
billionth of a meter). Our brain interprets the various wavelengths
of light as different colors. Red has the longest wavelength, and
violet the shortest. When we pass sunlight through a prism, we
see that it’s actually composed of many wavelengths of light. The
prism creates a rainbow by redirecting each wavelength out a
slightly different angle.

5. The entire electromagnetic
spectrum, from the lowest
to the highest frequency
(longest to shortest
wavelength), includes all
radio waves (e.g.,
commercial radio and televi
sion, microwaves and
radar), infrared radiation,
visible light, ultraviolet
radiation, rays, and gamma
rays. Nearly all frequencies
and wavelengths of
electromagnetic radiation
can be used
for spectroscopy.

6. Astronomers use the entire electromagnetic spectrum to
observe a variety of things. Radio waves and microwaves –
the longest wavelengths and lowest energies of light – are
used to peer inside dense interstellar clouds and track the
motion of cold, dark gas. Radio telescopes have been used
to map the structure of our galaxy while microwave
telescopes are sensitive to the remnant glow of the Big
Bang.

7. THANK YOU.
PREPARED BY: JOSEPHINE L. SISON
BSED IV MATH