Question

how can mechanical waves help in the treatment of cancer?
ultrasound is used to improve absorption of a radioactive pellet by a tumor.
the radioisotope in a radiopharmaceutical releases sound waves into surrounding cells.
beams of x - rays are targeted at a cancerous tumor from outside the body.
cells absorb chemotherapy drugs more easily after being treated with ultrasound.

Explanation:

Ultrasound is a type of mechanical wave. It can be used to enhance the absorption of chemotherapy drugs by cells, which helps in cancer treatment. X - rays are not mechanical waves and the release of sound waves by radiopharmaceuticals is not a common mechanism in cancer treatment. Also, ultrasound is not typically used to improve absorption of radioactive pellets by tumors in the described way.

Answer:

D. Cells absorb chemotherapy drugs more easily after being treated with ultrasound.