Answer:
A
Explanation:
The barcode is being read by a laser that scans along the length of the sequence, reflecting more light from the white strips and less from the black strips. Hope this helps!
When you are doing a experiment, you are testing if your hypothesis is correct or false. If your hypothesis is false, you have to disgard it. If it is correct, you have to do many more parallels, and if they also confirm your hypothesis, your hypothesis can become a theory.
Answer:
carbon-14
Explanation:
becouse protons and neutrons are nagetivly charged
Graham's Law,
<span>Rate 1 / Rate 2 = √[M2/M1] </span>
<span>Just substitute, remembering M(NO2) = 46 g/mol, </span>
<span>0.850 = √[46/M1]; </span>
<span>Solving, M1 = 63.7 g/mole. The other gas could be SO2, which has molecular weight 63.9 g/mole.</span>
The speed of light in a vacuum stands at “exactly 299,792,458 metres per second“. The reason today we can put an exact figure on it is because the speed of light in a vacuum is a universal constant that has been measured with lasers; and when an experiment involves lasers, it's hard to argue with the results.
