Problem 22.44 Proton-beam therapy can be preferable to X rays for cancer treatme

Question

Problem 22.44

Proton-beam therapy can be preferable to X rays for cancer treatment (although much more expensive) because protons deliver most of their energy to the tumor, with less damage to healthy tissue. A cyclotron used to accelerate protons for cancer treatment repeatedly passes the protons through a 15-kV potential difference.

Part A

How many passes are needed to bring the protons' kinetic energy to 1.1 ×1011 J?

4600

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Correct

Part B

What's that energy in eV?

68.75

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Incorrect; Try Again; 4 attempts remaining

Problem 22.44

Proton-beam therapy can be preferable to X rays for cancer treatment (although much more expensive) because protons deliver most of their energy to the tumor, with less damage to healthy tissue. A cyclotron used to accelerate protons for cancer treatment repeatedly passes the protons through a 15-kV potential difference.

Part A

How many passes are needed to bring the protons' kinetic energy to 1.1 ×1011 J?

4600

SubmitMy AnswersGive Up

Correct

Part B

What's that energy in eV?

68.75

SubmitMy AnswersGive Up

Incorrect; Try Again; 4 attempts remaining

Explanation / Answer

as

1 eV = 1.602 x 10-19 J

=> 1 J = (1/(1.602 x 10-19)) eV

=> 1.1 x 10-11 J = (1.1 x 10-11/(1.602 x 10-19)) eV = 68664169.8 eV

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