E.M. SPECTRUM & RADIATION

Question 1

Of all E.M. waves, the ones carrying the least energy per photon are?

Answer 1

Radio Waves

Question 2

The unit of frequency, in waves per second passing the observer, is measured in?

Answer 2

HERTZ

Question 3

Kirchhoff’s laws that deals with the electron levels in the atomic state?

Answer 3

Spectral analysis

Question 4

Ultraviolet radiation is almost completely blocked by

Answer 4

our ozone in our stratosphere.

Question 5

Long wavelength =
Short wavelengths =

Answer 5

Low frequency
High Frequency

Question 6

X-Rays were first detected beyond the Earth in the Sun in( what decade)?

Answer 6

Late 1940s

Question 7

The bottom of the wave is the

Answer 7

trough

Question 8

What is room temperature in K°, C°, & F°?

Answer 8

K = 293
C = 20
F = 68

Question 9

Light waves differ fundamentally from water or sound waves because?

Answer 9

Light energy doesn’t have to travel through a physical medium like air or water.

Question 10

A mixture of the colors blue & green & red and blue are which two new colors?

Answer 10

White light, Overlapping areas appear different colors

Question 11

X-rays, visible light, and radio waves are all forms of _____ radiation.

Answer 11

Electromagnetic

Question 12

In astronomy the medium of movement will be?

Answer 12

A wave picture ; water & sound

Question 13

Antares would produce more what than visible light.

Answer 13

infrared rays

Question 14

What is the temperature at which water boils on the Kelvin scale?

Answer 14

373 K

Question 15

Energy that is blocked by our atmosphere is the __???__ of the atmosphere to that wavelength.

Answer 15

man idk

Question 16

Reflected light does not give ___ of a black body space.

Answer 16

Temperature

Question 17

The most energetic forms of EM radiation are:

Answer 17

Gamma rays

Question 18

Know the longest and shortest span of the wavelengths of color

Answer 18

Red & violet

Question 19

_____ light is Responsible for suntans (and burns!)

Answer 19

Ultraviolet

Question 20

The distance between two successive wave crests is the _______ of a wave?

Answer 20

Wavelength

Question 21

Blue pigment reflects

Answer 21

Blue light & colors to either side of blue namely, green and violet.

Question 22

Every element has a signature of emission lines that are?

Answer 22

Every element has a DIFFERENT fingerprint; different energy levels in its atomic structure

Question 23

Allows a measurement of Radial or line of sight motion of a light source.

Answer 23

Doppler Effect

Question 24

Why is the Kelvin scale used in Astronomy?

Answer 24

As an absolute temperature scale, begins at absolute zero and lacks negative values.

Question 25

If the wavelengths of a sound pitch longer and lower pitched the object is moving

Answer 25

away

Question 26

Who measured an elevated temperature just off the red end of a solar spectrum – infrared energy?

Answer 26

Sir William Herchel

Question 27

What source of E.M. radiation is typical of sources millions of degrees hot?

Answer 27

X-rays

Question 28

What is freezing recorded at in C°, K°, and F°?

Answer 28

K = 273
C = 0
F = 32

Question 29

A spectrum = the amount of light given off by an object at a range of wavelengths.

Answer 29

Continuous Spectrum

Question 30

If a light source is approaching you, you will observe

Answer 30

It’s spectral lines shifting to shorter wavelengths (blueshift)

Question 31

Dark hydrogen lines appear against a continuous visual spectrum is an example of

Answer 31

Absorption

Question 32

We receive the peak energy from our star in the ______ region of the spectrum.

Answer 32

yellow/green ; visible

Question 33

A star’s spectral lines are red shifted, it must be?

Answer 33

Moving away

Question 34

What colors are the easiest and toughest to see at night?

Answer 34

In the dark; yellow , In the daylight; green.

Question 35

Of all forms of EM radiation, which forms reach the surface of the earth best?

Answer 35

Infrared Wave

Question 36

Visible light is created at ____ K degrees on the Kelvin scale

Answer 36

600

Question 37

What is an example of white light? (THINK BIG)

Answer 37

The sun