Maths-

General

Easy

Question

# The eccentricity of an ellipse whose centre is at the origin is If one of its directrices is then the equation of the normal to it at is

## The correct answer is:

### The given ellipse is depicted in the following figure:

Eccentricity of ellipse is 1/2. Now

That is,

Therefore,

Hence, the equation of the given ellipse is written as

Therefore, the equation of normal at

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Chemistry-

### These are the first eight ionization energies for a particular neutral atom. All values are expressed in MJ mol^{-1}. How many valence electrons do/does this atom possess?

1st |
2nd |
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4th |
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6th |
7th |
8th |

1.31 |
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71.33 |
84.01 |

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1st |
2nd |
3rd |
4th |
5th |
6th |
7th |
8th |

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