What temperautre is necesasry for the helium flash to occur?

The answer is 100 million K.
The helium flash happens in the hydrogen-exhausted core of a star that has become a red giant. When gravitational pressure has raised the temperature of the dormant helium core to a temperature of about 100 million K, the helium nuclei start to undergo a thermonuclear reactions.

The three levels of processing are -

1. Structural processing (Part of shallow Processing)

2. Phonemic processing (Part of shallow Processing)

3. Semantic processing (Deep Processing)

Explanation:

Craik and Lockhart in 1972 defined three levels of processing of memory –  

a)Shallow Processing – In shallow processing, repetition is done to hold the memory of   things. It has two forms  

1.Structural Processing - The physical qualities associated with something is processed at this level of memory processing.

For example – colour, shape, size etc. of any object

2.Semantic processing – The sound associated with something is processed at this level

b. Deep Processing –

3. Semantic processing - At this stage the meaning associated with a word is encoded. It is an in-depth analysis of information which helps in recalling the things.