The mass of density bottle of volume 50cm3 is 10g when empty. Aluminium turnings are poured into the bottle and the total mass is 60g. Water is then added into the turnings till the bottle is full. If the total mass of the bottle and its contents is 90g, calculate the density of the aluminium turnings.

Total density = T. mass / T. Volume.

= 90/ 50

= 1.8 gm/ cm3

Now,

Mass of Water = 90 - 60

= 30 gm.

Density = Mass/ Volume

= 30/ 50

= 0.6 gm /cm3

Now,

Density of Aluminium = 1.8 - 06

= 1.2 gm/ cm^3

#carryonlearning

waves moving from a fast medium to a slow medium will experience a reflection as light travels more slowly than red light. total internal reflection occurs when the critical angle is.