GATE-2007 (43) A basaltic lava flow is found to have
43) A basaltic lava flow is found to have a $\frac{87_{sr}}{86_{sr}}$ ratio of 0.72 and $\frac{87_{Rb}}{86_{sr}}$ ratio of 0.750. if the initial $\frac{87_{sr}}{86_{sr}}$ value is determined to be…