An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?
Answer (2)
A current of 15.0 A over 30 seconds results in a charge of 450.0 C. This corresponds to approximately 2.81 x 10^21 electrons flowing through the device. The calculation involves understanding current, charge, and the charge of a single electron.
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To determine which option would decrease the number of salmon living in the river, let's examine each possibility:
A new disease that affects the salmon :
A disease specifically affecting salmon could lead to illness or death among the salmon population. Diseases can spread quickly, especially in dense populations, causing a significant decrease in the number of healthy salmon.
A new species that the salmon can prey on :
If a new species that the salmon can eat is introduced, this could actually increase the salmon population by providing an additional food source, likely improving the salmon's health and reproductive success.
A decrease in light around the river :
A decrease in light might affect the river environment in various ways, such as altering plant growth. However, unless this environmental change directly affects the salmon's health or food sources significantly, or alters the ecosystem balance drastically, it may not directly cause a decrease in salmon numbers.
A decrease in the salmon's predators :
A decrease in predators would likely result in an increase in the salmon population because they would face less threat and mortality from predation.
Given these options, the most likely factor to decrease the number of salmon living in the river would be A new disease that affects the salmon . This is because a disease could have a direct and detrimental impact on salmon health and survival.
