A tuning fork of frequency \[420\,\,Hz\] completes \[70\] vibrations. Find the distance travelled by sound in air.\[(v=360\,\,m\,\,{{s}^{-1}})\]

A tuning fork of frequency \[420\,\,Hz\] completes \[70\] vibrations.

1.	A tuning fork of frequency \[420\,\,Hz\] completes \[70\] vibrations. Find the distance travelled by sound in air.\[(v=360\,\,m\,\,{{s}^{-1}})\]
A.	\[20\,\,m\]
B.	\[50\,\,m\]
C.	\[60\,\,m\]
D.	\[80\,\,m\]
Answer» D. \[80\,\,m\]

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A tuning fork of frequency \[420\,\,Hz\] completes \[70\] vibrations. Find the distance travelled by sound in air.\[(v=360\,\,m\,\,{{s}^{-1}})\]

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