<em>Answer:</em>
![\boxed{N_t =0.1953125 \: grams}](https://tex.z-dn.net/?f=%5Cboxed%7BN_t%20%3D0.1953125%20%5C%3A%20grams%7D)
Explanation:
<em>Formula:</em>
![N_t = N_0( { \frac{1}{2} })^{ \frac{t}{t_ \frac{1}{2} } }](https://tex.z-dn.net/?f=N_t%20%3D%20N_0%28%20%7B%20%5Cfrac%7B1%7D%7B2%7D%20%7D%29%5E%7B%20%5Cfrac%7Bt%7D%7Bt_%20%5Cfrac%7B1%7D%7B2%7D%20%7D%20%7D%20)
Where Nt is the amount of substance remaining after time t,
N0 is the amount of substance at time t = 0,
t is the time at which we have to find out how much substance disintegrated from t = 0 to t = t
& t_1/2 is the half life corresponding radioactive sample.
<em>Given:</em>
N0 = 200g
t= 40 days
t1/2 = 4 days
<em>To find:</em>
Nt =?
<em>Solution:</em>
Substituting given data in above formula,
![N_t = N_0( { \frac{1}{2} })^{ \frac{t}{t_ \frac{1}{2} } } \\ N_t = 200( { \frac{1}{2} })^{ \frac{40}{4 } } \\ N_t = 200 \times 0.0009765625 \\ \boxed{N_t =0.1953125 \: grams}](https://tex.z-dn.net/?f=N_t%20%3D%20N_0%28%20%7B%20%5Cfrac%7B1%7D%7B2%7D%20%7D%29%5E%7B%20%5Cfrac%7Bt%7D%7Bt_%20%5Cfrac%7B1%7D%7B2%7D%20%7D%20%7D%20%5C%5C%20N_t%20%3D%20200%28%20%7B%20%5Cfrac%7B1%7D%7B2%7D%20%7D%29%5E%7B%20%5Cfrac%7B40%7D%7B4%20%7D%20%7D%20%5C%5C%20N_t%20%3D%20200%20%5Ctimes%200.0009765625%20%5C%5C%20%5Cboxed%7BN_t%20%3D0.1953125%20%20%5C%3A%20grams%7D%20)
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The difference betweek xylem and phloem is that (1) xylem is unidirectional it only moves up to the plants stem while phloem is bidirectional it goes uop and down to the stem and leaves. (2) Xylem only transport water and mineral to aerial part of the plants while phloem transports food and nutrients.
Answer:
infrared waves are longer than gamma rays
Explanation:
according to the order :
radio, microwaves, infrared, light, ultraviolet, X-ray, gamma rays
radio waves have the highest wavelenght and lowest frequency, gamma rays have the highest frequency and lowest wavelength.
1 is A 2 is B
Primary Consumers are Herbivores (vegetarians) and Secondary Consumers are Carnivores (meat eaters)
A because endothermic reactions require a net gain of energy (in the form of heat)