Answer:

Explanation:
Given that:
The energy of the photon = 2.3 eV
Energy in eV can be converted to energy in J as:
1 eV = 1.60 × 10⁻¹⁹ J
So, Energy = 
Considering

Where,
h is Plank's constant having value 
c is the speed of light having value 
is the wavelength of the light being bombarded
Thus,




Also,
1 m = 10⁻⁹ nm
So,

Answer:

Explanation:
,
are strong electrolytes. Hence they are fully ionized in aqueous solution.
is a sparingly soluble salt. Hence it remains undissociated in aqueous solution.
So, total ionic equation:

Net ionic equation is written by omitting spectator ions from total ionic equation.
Here,
and
ions are spectator ions as they remain present on both side of total ionic equation.
So, net ionic equation:

So, option (d) is correct.
Barium is a chemical element with symbol Ba and atomic number 56. It is the fifth element in group 2 and is a soft, silvery alkaline earth metal. Because of its high chemical reactivity, barium is never found in nature as a free element. Thanks and I hope it helped.