can someone help me answer this correctly in the next 20 minutes? I’ll give out a brainliest if you can answer it right :)

Explanation:

Divide 1.5 over 2 to get 1.5/2 = 0.75

In 0.75 seconds, the sound wave goes from the person's mouth to the cave wall. Then another 0.75 seconds pass by and the echoed sound wave reaches the person's ear. So we have a total duration of 0.75+0.75 = 1.5 seconds.

Let's just focus on one leg of the trip.

The sound wave travels at a speed of 340 m/s and goes for 0.75 seconds

Meaning that,

distance = rate*time

distance = (340 m/s)*(0.75 s)

distance = (340*0.75) m

distance = 255 m

divide the right side by the left side

0.024÷1.2=0.02 for example

beta is electron from nucleus

something from nucleus has changed, but charge must be same for cons of charge