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In astronomy what is 21-cm radiation With what element is it associated?
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What information does 21 cm radiation provide about the gas clouds?
The 21cm line shows that the gas cloud contains hydrogen.
How many feet in 21cm?
21 centimeters is 0.69 feet.
Light energy is produced by the activity of what around the what of an atom?
light may be produced from an object by simple heating. This glow is not characteristic of any particular element. When a chemical element is heated to a great degree, then the electrons will be forced into higher orbits than those which they usually occupy. When the chemical element cools, the electrons will emit the energy they absorbed, and will emit a light which is quite specific to the particular element. This is the method by which we can determine which chemical elements are in a distant star. Incidentally, the timeline of the Big Bang suggests that the universe remained dark until the matter cooled enough to condense into atoms then eventually, the first stars. This may have been as late as 150 million years to 1 billion years after the Big Bang. In those early years the only radiation may have been the 21cm hydrogen line.
What light rays have the longest wavelength?
The longest wavelength photon I could find out about was in a maser (microwave version of a laser) which uses emission between two hyperfine levels of atomic hydrogen. This had a frequency of 1.4 GHz and a wavelength of 21cm.
A stack of 500 sheets of paper measuring 28cm times 21cm is 44.5mm high and has a mass of 2090g what is the density of the paper per cubic centimeter?
The question is implying, and we have to assume, that the 500 sheets are packed togetherwithout any air or space of any kind between the individual sheets; the package is equivalentto a solid brick of paper material that's 44.5 mm high.44.5 mm = 4.45 cmVolume of the brick = (28 x 21 x 4.45) = 2,616.6 cm3Density = (mass) / (volume) = (2,090) / (2,616.6) = 0.7987 gm/cm3 (rounded)
What information does 21cm radiation provide about the gas clouds?
presence of ionized hydrogen
What information does 21 cm radiation provide about the gas clouds?
The 21cm line shows that the gas cloud contains hydrogen.
Which is bigger 21cm or 205mm?
205mm = 20.5cm 21cm > 20.5cm
What is one third of 21cm?
1/3 of 21cm = 1/3*21 = 7 cm
how to calculate the fifth of 21cm?
A fifth of 21cm is 1/5 x 21 1/5 of 21 is 21/5, which is equal to 4.2 A fifth of 21cm is 4.2 cm
What is the approximate diameter of a circle whose circumference is 21cm?
The approximate diameter of a circle whose circumference is 21cm is: 6.68cm
Which is the biggest out of 0.2m 21cm and 2200mm?
2200mm
What is the area of a circle with the radius 21cm?
A = 1385cm2
What is the answer d21cm?
area of a circle and the question is d=21cm
What is the area of a circle that has a radius of 21cm?
A = 1,385.4 cm2
What is the area of the circle if the diametere is 21cm?
A = 346.36 cm2
What is the width of a A4 piece of paper?
29.7cm by 21cm
