An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?
Answer (2)
To find the probability that a female student chose strawberry ice cream, we can follow these steps:
Identify the Total Number of Female Students:
According to the information, there are 21 female students in total.
Identify the Number of Female Students Who Chose Strawberry Ice Cream:
From the given data, 9 female students chose strawberry ice cream.
Calculate the Probability:
Probability can be found by dividing the number of favorable outcomes by the total number of possible outcomes. In this case, it's the ratio of female students who chose strawberry ice cream to the total number of female students. Probability = Total number of female students Number of female students who chose strawberry = 21 9
Simplify the Fraction:
We simplify 21 9 by finding the greatest common divisor (GCD) of 9 and 21, which is 3. 21 9 = 21 ÷ 3 9 ÷ 3 = 7 3
Conclusion:
The probability that a female student chose strawberry ice cream is 7 3 .
Thus, the correct answer is B. 7 3 .
To find the number of electrons flowing through an electric device delivering 15.0 A for 30 seconds, we first calculate the total charge using the formula Q = I ⋅ t , which gives us 450 C. Then, by dividing this charge by the charge of a single electron (approximately 1.6 × 1 0 − 19 C), we find that roughly 2.81 × 1 0 21 electrons flow through the device.
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