Question

the ratio of root mean square value and peak value of an alternating current is what

Answer 1

50 hz of alternating current

Answer 2

The term “RMS” value means “Root-Mean-Squared” value. it can be calculated when dissipation in resistor takes place as heat or we can say  the amount of AC power that produces the same heating effect as an equivalent DC power. The symbols used for defining an RMS value are $V_{RMS}$

Peak value is the maximum value attained by an alternating current during a cycle. It is also known as the maximum value or amplitude. The sinusoidal alternating current obtains its peak value at 90 degrees. The symbols used for defining an peak value are  $V_{M}$  .  

So, the relation between RMS and PEAK value of a alternating current can be given as

$V_{RMS}=\frac{V_{M}}{\sqrt{2}}\\\\\frac{V_{RMS}}{V_{M}}=\frac{1}{\sqrt{2}}\\\\V_{RMS}:V_{M}=1:\sqrt{2}$