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Mathematics: Post your doubts here!

need help with this question Find the value of x satisfying the equation sin−1 (x − 1) = tan−1 (3)
- Nicolle L
- Post #15,416
- May 3, 2015
- Forum: A-Levels
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Physics: Post your doubts here!

M/J 2007 Paper 4 Q5 (b)(ii) State which combination, if any, of monochromatic light and metal surface could give rise to photo-electric emission. Give a quantitive explanation of your answer. Can someone please help? Thanks!
- Nicolle L
- Post #12,946
- Apr 25, 2015
- Forum: A-Levels
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Chemistry: Post your doubts here!

Magnesium nitrate, Mg(NO3)2, will decompose when heated to give a white solid and a mixture of gases. One of the gases released is oxygen. 29.7g of anhydrous magnesium nitrate is heated until no further reaction takes place. What mass of oxygen is produced? A 3.2g B 6.4g C 12.8g D 19.2g
- Nicolle L
- Post #12,164
- Apr 16, 2015
- Forum: A-Levels

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