presence of ionized hydrogen
21 cm radiation provides information about the distribution, temperature, and motion of atomic hydrogen gas clouds in interstellar space. By studying the spectral line of this radiation, astronomers can infer the presence of these gas clouds, their speed, and even their magnetic field strength. This data helps in understanding the structure and dynamics of the Milky Way galaxy and the universe as a whole.
205mm = 20.5cm 21cm > 20.5cm
1/3 of 21cm = 1/3*21 = 7 cm
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
The approximate diameter of a circle whose circumference is 21cm is: 6.68cm
A = 1385cm2
2200mm
29.7cm by 21cm
A = 346.36 cm2
A = 1,385.4 cm2
area of a circle and the question is d=21cm
21cm and 16cm.what is the difference in height?