Answer:

Explanation:
Given that
Wavelength λ=192 nm
So energy of photon,E

Now by putting the values




We know that
Kinetic energy given as




Answer:
, it will sink
Explanation:
The density of an object is given by

where
m is the mass of the object
V is its volume
For the body in the problem, we have
m = 4 kg = 4000 g

Therefore, its density is

And the object will sink in water, because its density is larger than that of water, which is
. (an object sinks when its density is larger than that of water, otherwise it floats).