Answer:
A. 19.8 cm.
Explanation:
The apparent depth of the combination is
As it mentioned that the two clear but non-mixing liquid having depth of 15 cm that placed in a glass container together
Also the refractive indices would be 1.75 and 1.33
Based on the above information
As we know that
Refractive indices = real depth ÷ apparent depth
1.33 ÷ 1.75 = 15 ÷ apparent depth
So, it would be 19.736842 cm
Now the combination of apparent depth would be
= ( 19.736842 + 15) ÷ (1.75)
= 19.8 cm
hence, the correct option is A.
The specific heat of water is 4.18 J/gC. This means that if 4.18 joules of energy (heat) is applied to a gram of water, the temperature will increase one degree Celsius.
The question has water increasing from 10C to 30C. This means that the water is increasing by 30-10=20C. There is also 20 grams of water. So, the amount of heat energy needed to do this is (4.18*20*20)=1672J
Copper conducts electricity
D it’s definitely D if I’m wrong sorry…