O.N. of Na = +1
O.N. of O = -2
Let, O.N. of Tin = x
1*2 + x + -2*2 = 0
2+x-4 = 0
x-2 = 0
x = 2
SO OPTION C IS YOUR ANSWER......
Answer:
Explanation:
A solar collector is a device that absords Sun's heat energy to heat air or water. It is majorly used for heating purpose, and do not generate electricity directly.
The flow tubes and collector plate are black in color so as to increase the intensity of heat generated by the collector. A black body is a good absorber of heat, it absorbs most heat directed to the collector. Also, a black body is a good radiator of heat, the heat absorbed is rediated to the appropriate channels for the heating of water or air molecules. The black color increases the efficeincy and percentage of solar energy absorbed by the collector.
If a reflective color is used (e.g white), major percentage of the incident heat would be reflected. This would decrease the efficiency of the solar collector.
D = m / V
D = 2790 g / 205 mL
D = 13.60 g/mL
Answer:
One calorie is equivalent to 4.18joules
Answer:
Explanation:
a ) Speed of radio waves in space = speed of light in space
= 3 x 10⁸ m /s
Time taken = distance / speed
= 8.1 x 10⁷ x 10³ / 3 x 10⁸ s
= 2.7 x 10² s
= 270 s
b )
Distance = speed x time
= 3 x 10⁸ x 1.2 m
= 3.6 x 10⁸ m
= 3.6 x 10⁵ km
