<span>The right answer is D. In a situation where the sound wave reaches the ear and the reflected wave reaches the ear less than 0.1 seconds later, the individual would not be able to hear an echo. There needs to a far more significant delay between the sound and the reflection of said sound reaching the listener's ear for the echo effect to become apparent.</span>
Answer:
C + 2H2 ⇒ CH4
Explanation:
In order to balance a chemical equation you need to make sure that the number of atoms on both sides are equal
C + H2 = CH4
C = 1
H = 2
Products:
C = 1
H = 4
H2 = 2 × 2 = 4
C + 2H2 ⇒ CH4
Hope this helps.
Decomposition of stone due to acid rain<span />
<h2>The Answer is option d "polymers"</h2>
Explanation:
- Polymers are also categorized as plastics.
- Polymers are usually soft and ductile that is it can be drawn into wires.
- Polymers have low heat capacity or heat conductivity that is the extent to which a polymer acts as an insulator towards the temperature.
- Polymers can be opaque ( not be seen through), translucent or transparent (to be seen clearly through).
- Hence the right answer is option d "polymers".