Recent content by Littlegirloud

I've checked again and it is definitely 60 grams. Does that mean I need to equate the tissue dose to kg so it tallies with the final measure? Perhaps? D = E\M D = 420/0.06 D = 7 D = 7000 J kg-1

Homework Statement Calculate the absorbed dose of radiation for tissue that suffers a mean energy absorbed of 420 Joules in a quantity of tissue that has a mass of 60g. Homework Equations This is really my question. No relevant equation is provided in these materials so my independent...

Here's my updated attempt. Closer? The diameter of the baby’s head can be calculated using distance = speed x time where: Speed of ultrasound = 1250 m/s = 0.00125 m/ms and if 96 microseconds is the time taken for the wave to reflect then time taken across the...

Thank you!

Thanks for the pointer on the calculation, I'll do it again. Is the second mistake that I'm only considering travel time in one direction? So 96x2 to a count for return time too? For some reason I'm just really struggling to get my head around (pun half intended) this one.

Homework Statement Calculate the diameter of a baby's head if there is a time delay of 96 microseconds between receiving pluses from either side of the skull and the speed of ultrasound can be assumed to be 1250m/s. Homework EquationsThe Attempt at a Solution The diameter of the baby’s head...