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How is a PET scanner able to locate a tumour in the patient's body?

The patient is injected with a radioactive isotope with short half-life, for eg Fluorine-18. This isotope decays into positrons. The area damaged with tumour requires more blood supply compared to the health...
KD
Answered by Krish D. • Physics tutor
3941 Views

If a person weighs 400N and the total area of their feet is 120cm^2, what is the pressure they are exerting on the ground?

The formula for pressure is Pressure = Force / AreaIf the force is 400N and the area is 120 cm 2 , the pressure is equal to 400/120, which is 3.33 N/cm 2
JM
Answered by Jamie M. • Physics tutor
2294 Views

What is meant by terminal velocity?

Essentially that objects have a top speed falling through air to the ground, which is called terminal velocity. This is because we are surrounded by air, so when moving, objects have to push past the air par...
WC
Answered by William C. • Physics tutor
5063 Views

X-rays and gamma rays have different uses. Describe one use for X-rays and one use for gamma rays.

X-rays can be used to look at skeletons and find out whether a bone is broken. Gamma rays can be used to sterilise things such as food and medical equipment.
MR
Answered by Matt R. • Physics tutor
1953 Views

why is it that When there is a small droplet on a phone the pixels of the screen can be seen

Given that the drop is small enough it produces a semi sphere on screen of liquid due to surface tension. This acts like a powerful convex lens for the light coming from pixels on the phone screen hence allo...
AN
Answered by Adithya N. • Physics tutor
2033 Views