Answer
$0.946$
Work Step by Step
We can find the required ratio as follows:
$\frac{m_1}{m_2}=\frac{qBR_1/v}{qBR_2/v}$
$\implies \frac{m_1}{m_2}=\frac{R_1}{R_2}$
We plug in the known values to obtain:
$\frac{m_1}{m_2}=\frac{48.9}{51.7}$
$\frac{m_1}{m_2}=0.946$
