Answer:
A
Explanation:
Radiation can come from the Sun
Answer:
<h2>A. Mercury's orbit is shorter than Earth</h2>
You could let the air out of the balloon while it is under the water with a container filled with water upside down over it. And measure the water displacement.
Answer : The correct option is, (B) 
Solution :
According to the Graham's law, the rate of effusion of gas is inversely proportional to the square root of the molar mass of gas.

or,
..........(1)
where,
= rate of effusion of unknown gas = 
= rate of effusion of oxygen gas = 
= molar mass of unknown gas = ?
= molar mass of oxygen gas = 32 g/mole
Now put all the given values in the above formula 1, we get:


The unknown gas could be carbon dioxide
that has approximately 44 g/mole of molar mass.
Thus, the unknown gas could be carbon dioxide 