Astronomy Questions :(?

Question

i am absolutely hopeless at this... any help is SO MUCH appreciated ;) i don't even know if you need all these charts and graphs in order to answer the following questions, but i sure hope not. even HOW to answer the question would help.. thank you!

1) List the colors of the visible portion of the electromagnetic spectrum in order (long wave to short wave)

2) What is the difference between the spectrum of light bulbs and the spectra of gas tubes?

Answer 1

Legend:

γ = Gamma rays

HX = Hard X-rays

SX = Soft X-Rays

EUV = Extreme ultraviolet

NUV = Near ultraviolet

Visible light

NIR = Near infrared

MIR = Moderate infrared

FIR = Far infrared



Radio waves:

EHF = Extremely high frequency (Microwaves)

SHF = Super high frequency (Microwaves)

UHF = Ultra high frequency

VHF = Very high frequency

HF = High frequency

MF = Medium frequency

LF = Low frequency

VLF = Very low frequency

VF = Voice frequency

ELF = Extremely low frequencyThe electromagnetic (EM) spectrum is the range of all possible electromagnetic radiation. Also the "electromagnetic spectrum" (usually just spectrum) of an object is the frequency range of electromagnetic radiation with wavelengths from thousands of kilometres down to fractions of the size of an atom. It is commonly said that EM waves beyond these limits are uncommon, although this is not actually true. The short wavelength limit is likely to be the Planck length, and the long wavelength limit is the size of the universe itself (see physical cosmology), though in principle the spectrum is infinite.



Electromagnetic energy at a particular wavelength λ (in vacuum) has an associated frequency f and photon energy E. Thus, the electromagnetic spectrum may be expressed equally well in terms of any of these three quantities. They are related according to the equations:



wave speed (c) = frequency x wavelength

or





and





or





where:



c is the speed of light, 299,792,458 m/s .

h is Planck's constant, .

So, high-frequency electromagnetic waves have a short wavelength and high energy; low-frequency waves have a long wavelength and low energy.



When light waves (and other electromagnetic waves) enter a medium, their wavelength is reduced. Wavelengths of electromagnetic radiation, no matter what medium they are travelling through, are usually quoted in terms of the vacuum wavelength, although this is not always explicitly stated.











Electromagnetic Spectrum Image.







[edit] Spectra of objects

Nearly all objects in the universe emit, reflect or transmit some light. (One hypothetical exception may be dark matter.) The distribution of this light along the electromagnetic spectrum (called the spectrum of the object) is determined by the object's composition. Several types of spectra can be distinguished depending upon the nature of the radiation coming from an object:



If the spectrum is composed primarily of thermal radiation emitted by the object itself, an emission spectrum occurs.

Some bodies emit light more or less according to the blackbody spectrum.

If the spectrum is composed of background light, parts of which the object transmits and parts of which it absorbs, an absorption spectrum occurs.

Electromagnetic spectroscopy is the branch of physics that deals with the characterization of matter by its spectra

Answer 2

Yay! i'm answering a similar question as like 10 proper contributors. That makes me experience particular =). Yeah, I surely hate the 2012 questions, and ones that should be responded with wikipedia somewhat of filling up yahoo solutions with bogus questions. with assistance from some distance even if, the worst questions i bump into are ones that are truly copied and pasted proper from the worksheet or e book or in spite of it really is that their homework is and then to proper it off, they aspect out something about a reward for the first answer or something. also i visit't stand copied and pasted solutions from web pages that require no intuitive questioning in any way. pretty even as they don't even cite the region or in simple terms state "Yahoo search for" (in spite of if its fairly unhappy that they in simple terms looked for it and were given the answer even as the questioner ought to have in simple terms executed that themselves). On a tremendous be conscious, I do like countless the actual questions that are not in simple terms homework help or something yet truly someone who needs to strengthen their understanding about the international round them. i appreciate those questions and flow out of my thanks to respond to them. EDIT: Oh yeah, and questions in the incorrect area, someone in simple terms requested if unlawful extraterrestrial beings exist in the astronomy area. no longer in person-friendly words is that a stupid question yet its in the incorrect area...

Answer 3

long wave: violet, indigo,blue,green,yellow,orange, red: short wave