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What chemical compositions of betel leaves may react to oestrogen?
In a spherical container with small holes around (a perforated bowl), suppose there is a CO2 generator at the middle. In which area would the most number of CO2 particles go out from the container? (Lower part? Upper part? No difference?) Does the molecular weight effect this movement?
In a circular container with small holes around, suppose there is a CO2 generator at the middle. In which area would the most number of CO2 particles go out from the container? (Lower part? Upper part? No difference?) Does the molecular weight effect this movement?
Why does CO2 go down in the upward displacement method, and why it doesn't it go down in the normal atmosphere?
Is fog corrosive? If yes, why? If no, why not?
Question 4 : Anthropogenic contribuion to desertification excludes _________
overgrazing
bush burning,
depletion of resources
land management
Question 9 : Burning of fossil fuel contributes _______ of carbon dioxide to the atmosphere.
0.7
0.5
0.6
0.8
The threshold freq. Of a metal is 3.056×10^-15 J . If light of 4000amstrog wavelength is used will the electron be ejected or not?
which property of an element is not variable?
3×10^8. Photoshop a certain light radiation are found to produce 1.5 j. Calculate wavelength