A block of iron is suspended from one end of an equal-arm balance by a thin wire

Question

A block of iron is suspended from one end of an equal-arm balance by a thin wire. To balance the scales, 6.85 kg are needed on the scale pan at the other end. The density of iron is 7.87 times 103 kg/m3 and the density of water is 9.98 times 102 kg/m3 What is the volume of the block (in m3)? Next, a beaker of water is placed so that the iron block, suspended as above, is submerged in the beaker but not touching the bottom (see the figure). What mass (in kg) is now necessary to balance the scales?

Explanation / Answer

frequency=velocity/wave length

1) f1=3*10^8/4*10^-7

=0.75*10^15

=750THz(

2) f2=3*10^8/7*10^-7

=0.4285*10^15

=428.57THz

the range of visible light is 400THz to 790THz

hence smallest frequency is 428.57THz and highest frequency is 750THz

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