Two planets revolve round the sun with frequencies `N_(1)` and `N_(2)` revolutions per year. If their average orbital radii be `R_(1)` and `R_(2)` respectively, then `R_(1)//R_(2)` is equal to

Two spherical nuclei have mass number 216 and 64 with their radii R_(1) and R_(2) respectively. The ratio, (R_(1))/(R_(2)) is equal to

Two spherical nuclei have mass number 216 and 64 with their radii R_(1) and R_(2) respectively. The ratio, (R_(1))/(R_(2)) is equal to

Two planets have the same average density but their radii are R_(1) and R_(2) . If acceleration due to gravity on these planets be g_(1) and g_(2) respectively, then

Two planets move around the sun. The periodic times and the mean radii of the orbits are T_(1), T_(2) and r_(1) r_(2) respectively. The ratio T_(1)//T_(2) is equal to

Two planets move around the sun. The periodic times and the mean radii of the orbits are T_(1), T_(2) and r_(1) r_(2) respectively. The ratio T_(1)//T_(2) is equal to

A and B are two satellite revolving around the earth in circular orbits with radii R_(A) and R_(B) . Their periods T_(A) and T_(B) are 8 h and 1 h respectively. Then the ratio of (R_(A)//R_(B)) is equal to

Two spherical black bodies of radii R_(1) and R_(2) and with surface temperature T_(1) and T_(2) respectively radiate the same power. R_(1)//R_(2) must be equal to

Two spherical black bodies of radii R_(1) and R_(2) and with surface temperature T_(1) and T_(2) respectively radiate the same power. R_(1)//R_(2) must be equal to

Two spherical black bodies of radii R_(1) and R_(2) and with surface temperature T_(1) and T_(2) respectively radiate the same power. R_(1)//R_(2) must be equal to