Question:গামা রশ্মির দ্রুতি- 

A `3xx10^8ms^(-1)` 
B `9.11xx10^8ms^(-1)` 
C `3.9xx10^7ms^(-1)` 
D `3xx10^(10)ms^(-1)` 

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A 

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Md. Sohel Arman

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