The answer is C, 85.
Which sample has particles with the lowest average kinetic energy?
2 answers:
Answer : Option 4) 9.0 g of at 20°C
Explanation : Usually the average kinetic energy depends upon the state of the matter. Considering about the iodine at lower temperature the kinetic energy is found to be low. Whereas at higher temperature has higher kinetic energy value.
From the kinetic energy equation it can be easily related that K.E. is directly proportional to the temperature.
Refer the attached image for the relationship of temperature with kinetic energy.
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Answer:-
As we can see from the graphical data,
The distance covered by all the four runners is the same 5 km.
Among the four athletes, Athlete P covers the distance in under three hours.
It is the minimum time taken among the four athletes.
Thus Athlete P covers the 5 km distance in the minimum amount of time.
We know that speed =
Since time taken for P is minimum, his speed is the maximum. P ran the fastest.
Time taken by Q = 4.5 hours.
Speed of Q =
=
= 1.1 km/ hr
Time taken by R = 6 hours.
Speed of R =
=
= 0.8 km/ hr