Question

A powder contains 400mg of a radioactive isotope that emits α-particles.
The half-life of the isotope is 5 days.
What mass of this isotope remains after 10 days?

Answer 1

Answer:

1 cm = 10 mm

100 cm = 1 m

1000 m = 1 km

100 m = 0.5 km

gd ni8 sweet dreams

Explanation:

Answer 2

Explanation:

j☘ Photosynthesis is a process by which phototrophs convert light energy into chemical energy, which is later used to fuel cellular activities. The chemical energy is stored in the form of sugars, which are created from water and carbon dioxide.

☘ Photosynthesis reaction involves two reactants, carbon dioxide and water. These two reactants yield two products, namely, oxygen and glucose. Hence, the photosynthesis reaction is considered to be an endothermic reaction.

☘ Following is the photosynthesis formula:

6CO2 + 6H2O —> C6H12O6 + 6O2

☘ Unlike plants, certain bacteria that perform photosynthesis do not produce oxygen as the by-product of photosynthesis. Such bacteria are called anoxygenic photosynthetic bacteria. The bacteria that do produce oxygen as a by-product of photosynthesis are called oxygenic photosynthetic bacteria.