Radiations are used for the treatment of skin of a patient is
A. Alpha rays
B. Gamma rays
C. Beta rays
D. X-rays
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Physics
The maximum safe limit dose for persons working in a nuclear power station is ________________?
A. 1 rem per week
B. 5 rem per week
C. 4 rem per week
D. 3 rem per week
Which of the following will be a better shield against gamma rays ?
A. Ordinary water
B. Heavy water
C. Lead
D. Aluminum
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A device for producing high-velocity nuclei is
A. Cloud chamber
B. Linear accelerator
C. A mass spectrograph
D. Wilson cloud chamber
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Pair production can take place only with
A. X-rays
B. Gamma rays
C. UV-rays
D. IR-rays
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Pair production cannot take place in a vacuum as
A. Mass is not conserved
B. Energy is not conserved
C. Momentum is not conserved
D. The chargee is not conserved
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Alpha particles possess greater penetration power than that of beta particles due to its_____________?
A. Smaller ionization power
B. Greater ionization power
C. Neither greater nor smaller ionization power
D. Same ionization power
Beta particles ionize an atom
A. Due to the electrostatic force of attraction
B. Due to the electrostatic force of repulsion
C. Due to a direct collision
D. Due to the gravitational force
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Why gamma rays are used to kill bacteria to sterilize surgical equipment etc ?
A. Chargeless
B. Massless
C. Highly penetrating
D. All of above
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Strontium-90 is used as
A. α-particle source
B. β-particle source
C. γ-rays source
D. Neutron source
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