The equation for photosynthesis is 6h2o (water) + 6co2 (carbon dioxide) + light energy → c6h12o6 (glucose) + 6o2 (oxygen). when first discovered, scientists were trying to decide if the oxygen in the product came from carbon dioxide or water. which statement describes how scientists traced the path of oxygen?
they used a radioactive isotope and tracked it with a becquerel counter.
they used a radioactive isotope and tracked it with a geiger counter.
they used a stable isotope and tracked it with a becquerel counter.
they used a stable isotope and tracked it with a geiger counter.

I think the correct answer would be the last option. When the reaction was first discovered, the scientists used a stable isotope to determine or trace where the oxygen came from the reactants and they used a Geiger counter to track it. This counter is used for the detection of radioactive emmissions commonly the gamma and beta particles.

I BELIEVE that they used a radioactive isotope and tracked it with a Geiger counter.

But all i know is that They used a stable isotope and tracked it with a Geiger counter is incorrect, so dont choose that one.

hope this helps ya!

As per the question the two teams are playing tug of war.

Team A pulls the rope with a force of 450 N towards right.

Let the force exerted by team A is  F.

Hence F =450 N

Team B pulls the rope with a force of 415 N towards left.

Let the force exerted by team B is denoted by F'

Hence F'=415 N

Here F and F' are anti parallel as they are opposite in direction.Hence the angle between them is 180 degree.

We are asked to calculate the net force.

As per parallelogram law of vector  addition the net force acting on the rope will be-

                               

                                         

                                         

                                         

                                         

                                         

                                         

The direction of net force will be towards right. It is so because when two anti parallel vectors are added,the resultant of net force will be difference in their magnitude and its direction will be along the direction of bigger vector.