Answer:
D. 3.3 x 10^24
Explanation:
In a number representing a measurement, the significant figure are those digits that have a meaningful contribution to specify the resolution of the measurement.
When a number is written in scientific notation, it is written as:
where
m is the base
n is the exponent
When a number is written in this form, the number of significant figures is the number of digits contained in .
In this problem, our number is initially written as
We see that here "m" contains 4 digits, so here we have 4 significant figures.
In order to reduce it to 2 significant figures, we have to rewrite 3.311 as 3.3, therefore the new number will be:
Which is option D.
Answer: moles
Explanation: Boyle's law:
Boyle's law stated that volume and pressure are inversely proportional to each others by keeping the number of moles and temperature constant.
Mathematical expression:
P₁V₁ = P₂V₂ (n and T are constant)
Charles's law:
Charles's law stated that temperature and volume are directly related related to each others by keeping number of moles and pressure constant.
Mathematical expression:
V₁/T₁ = V₂ /T₂ (n and P are constant)
Gay-Lussac's law:
This law stated that pressure of gas is directly related to its temperature by keeping the number of moles and volume constant.
Mathematical expression:
P₁/T₁ = P₂ /T₂ (n and V are constant)
The dimensions of room are . Thus, volume of room will be:
Converting to
Since,
Thus,
Now, concentration of carbon monoxide in the urban apartment is , thus, mass of carbon monoxide can be calculated as follows:
Rearranging,
Putting the values,
converting
Since, thus,
Therefore, mass of carbon monoxide present in the room is .
UV rays and X-rays are electromagnetic waves (do not require material medium for transmission). They are part of the electromagnetic spectrum and travel with the speed of light (3×10^8 m/s). In this case i believe the answer is C, X-rays have a higher frequency compared to UV rays.