Second one i think.......
Answer:
D. a nonpolar covalent bond
I believe the answer is C.
Answer:
photons are emitted per second in a
Watt microwave oven.
Explanation:
The expression for the power is:-

Also, 
Where,
n = the number of photons
h = Plank's constant having value 
c = the speed of light having value 
= the wavelength of the light
So,

Thus, the expression for photons per second is:-

Given that:-
Power = 10³ Watt
( 1 cm = 0.01 m)
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So,

photons are emitted per second in a
Watt microwave oven.