The ratio of mass densities of nuclei of ""^( 40 ) C a and ""^( 16 ) O is close to :
If the densities of methane and oxygen are in the ratio 1 : 2 , the ration of rate diffusion of O_(2) and CH_(4) is respectively
The ratio of densities of oxygen and nitrogen is 16 : 14. At what temperature, the speed of sound in oxygen will be equal to its sped in nitrogen at 14^(@)C ?
Ratio of nuclear radii of ""^(135)Cs "to" ""^(40)Ca is
Obtain approximately the ratio of the radii of iron ._(26)Fe^(56) and calcium ._(20)Ca^(40) . What is the approximate ratio of their nuclear mass densities?
An isobar of ._(20)Ca^(40) is
In a radioactive sample. ._(19)^(40)K nuclei either decay into stable ._(20)^(40)Ca nuclei with decay constant 4.5 xx 10^(-10) per year or into stable ._(18)^(40)Ar nuclei with decay constant 0.5 xx 10^(-10) per year. Given that in this sample all the stable ._(20)^(40)Ca and ._(18)^(40)Ar nuclei are produced by the ._(19)^(40)K nuclei only. In time t xx 10^9 years. If the ratio of the sum of stable ._(20)^(40)Ca and ._(18)^(40)Ar nuclei to the radioactive ._(19)^(40)K nuclei is 99. The value of t will be. [Given : In 10 = 2.3]
The radius of the nucleus of ""_(8)O^(16) is 3 x× 10^(–15) m. Its density in kg//m^(3) will be about-
