Answer : The ratio of effusion rates for helium and argon is 3.2 : 1
Solution : Given,
Molar mass of Helium = 4 g/mole
Molar mass of Argon = 40 g/mole
Rate of effusion : It is defined as the rate of effusion of a gas is inversely proportional to the square root of the molar mass of the gas.
Formula used :

where, M is the molar mass.

Now put all the given values in this expression, we get

Therefore, the ratio of effusion rates for helium and argon is 3.2 : 1
I think that you mean Galcial Lake Outburst
- A glacial lake outburst is a outburst flood caused by the failure of dam containing galcial Lake.
- The glaciers melt and overflows the water body, This phenomena is termed as jökulhlaup.
- The proper definiton:- Sudden release of water from Lake due to melting of galcier.
Bk has an atomic number of 97 meaning that there are 97 protons and 152 neutrons.
I think the one that best describes a cyclone is the first one (a dust storm rapidly changing weather in an area)
The element found naturally in the earth , that has the highest atomic number is 7