Answer:
The current amount of the Potassium-40 sample is approximately 37.521 grams.
Explanation:
The amount of the sample of the radioactive isotope decays exponentially in time, the amount of mass of the sample as a function of time (
), in grams, is described below:
(1)
Where:
- Initial mass, in grams.
- Time, in years.
- Time constant, in years.
The time constant can be found from half life (
), in years, described in statement:
(2)
If we know that 
, 
and 
, then the current amount of the sample is:
The current amount of the Potassium-40 sample is approximately 37.521 grams.
i want to say it is D. because i believe that they are nocturnal animals and they are found in deserts.
<span> the British reaction to Amritsar – the officer commanding British troops at Amritsar, General Dyer, was simply allowed to resign his commission after an inquiry criticised his leadership during the riot. Many national Indians felt that he, and others in the army, had got away very lightly. The more radical Indians felt that the British government had all but sanctioned murder. </span>
Mexico City has a pleasant climate all year because of ___<span>its high elevation </span>__.
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Answer:
Changes in the pressure create the flow of the air to move up and down in the ear and thus create popping sound.
Explanation:
- The ear-popping is caused by the phenomenon of the opening of the Eustachian tube when one swallows and it might be automatically when you blow our nose or are setting in an airplane and this sound is created when the air enters the middle ear through the tube.
