E.M. SPECTRUM & RADIATION Flashcards
Of all E.M. waves, the ones carrying the least energy per photon are?
Radio Waves
The unit of frequency, in waves per second passing the observer, is measured in?
HERTZ
Kirchhoff’s laws that deals with the electron levels in the atomic state?
Spectral analysis
Ultraviolet radiation is almost completely blocked by
our ozone in our stratosphere.
Long wavelength =
Short wavelengths =
Low frequency
High Frequency
X-Rays were first detected beyond the Earth in the Sun in( what decade)?
Late 1940s
The bottom of the wave is the
trough
What is room temperature in K°, C°, & F°?
K = 293
C = 20
F = 68
Light waves differ fundamentally from water or sound waves because?
Light energy doesn’t have to travel through a physical medium like air or water.
A mixture of the colors blue & green & red and blue are which two new colors?
White light, Overlapping areas appear different colors
X-rays, visible light, and radio waves are all forms of _____ radiation.
Electromagnetic
In astronomy the medium of movement will be?
A wave picture ; water & sound
Antares would produce more what than visible light.
infrared rays
What is the temperature at which water boils on the Kelvin scale?
373 K
Energy that is blocked by our atmosphere is the __???__ of the atmosphere to that wavelength.
man idk
Reflected light does not give ___ of a black body space.
Temperature
The most energetic forms of EM radiation are:
Gamma rays
Know the longest and shortest span of the wavelengths of color
Red & violet
_____ light is Responsible for suntans (and burns!)
Ultraviolet
The distance between two successive wave crests is the _______ of a wave?
Wavelength
Blue pigment reflects
Blue light & colors to either side of blue namely, green and violet.
Every element has a signature of emission lines that are?
Every element has a DIFFERENT fingerprint; different energy levels in its atomic structure
Allows a measurement of Radial or line of sight motion of a light source.
Doppler Effect
Why is the Kelvin scale used in Astronomy?
As an absolute temperature scale, begins at absolute zero and lacks negative values.
If the wavelengths of a sound pitch longer and lower pitched the object is moving
away
Who measured an elevated temperature just off the red end of a solar spectrum – infrared energy?
Sir William Herchel
What source of E.M. radiation is typical of sources millions of degrees hot?
X-rays
What is freezing recorded at in C°, K°, and F°?
K = 273
C = 0
F = 32
A spectrum = the amount of light given off by an object at a range of wavelengths.
Continuous Spectrum
If a light source is approaching you, you will observe
It’s spectral lines shifting to shorter wavelengths (blueshift)
Dark hydrogen lines appear against a continuous visual spectrum is an example of
Absorption
We receive the peak energy from our star in the ______ region of the spectrum.
yellow/green ; visible
A star’s spectral lines are red shifted, it must be?
Moving away
What colors are the easiest and toughest to see at night?
In the dark; yellow , In the daylight; green.
Of all forms of EM radiation, which forms reach the surface of the earth best?
Infrared Wave
Visible light is created at ____ K degrees on the Kelvin scale
600
What is an example of white light? (THINK BIG)
The sun
