How many impulses are there in 0.25 seconds?

To determine the number of impulses that occur in 0.25 seconds, it's essential to understand the concept of impulses in radiology, particularly in the context of x-ray exposure. An impulse in radiology typically refers to a single electrical signal or a pulse associated with the generation of x-rays.

X-ray machines often operate at a frequency of 60 impulses per second, which is the standard in many regions. By using this frequency, one can calculate the number of impulses in a specific time frame.

To find the number of impulses in 0.25 seconds at 60 impulses per second, you would multiply the frequency by the time duration:

[

60 \text{ impulses/second} \times 0.25 \text{ seconds} = 15 \text{ impulses}

]

This calculation shows that within a 0.25-second interval, there would be 15 impulses. Therefore, the correct answer effectively illustrates the relationship between time and impulse frequency in the functioning of x-ray machines, making it clear why 15 impulses is the accurate response in this scenario.