The vowel .r/ri in Sanskrit and Hindi

[Peter Friedlander]

Dear list members
Would you agree with the statement:
'Most Hindi speakers pronounce the vowel .r as if it were the ri in rip.'
If you do then when do you think this change from the vowel sound .r to ri
began to take place and is their a similar variation in Sanskrit?
thanks 
Dr Peter G Friedlander
Department of Asian Studies
La Trobe University
Bundoora 3084
Victoria
Australia
tel:(03) 9479 2064