The unit of radioactivity curie is equal t:
A. 3.74 x 109 disintegration per sec
B. 3.70 x 1010 disintegration per sec
C. 3.55 x 1010 disintegration per sec
D. 3.60 x 1010 disintegration per sec
An alpha particle can produce fluorescence in:
A. ZnS
B. Barium platinocyanide
C. Calcium tungstate
D. All of above
Geiger counter is suitable for:
A. Fast counting
B. Extremely fast counting
C. Slow counting
D. All situations
Strontium-90 is used as:
A. α-particle source
B. β-particle source
C. γ-rays source
D. Neutron source
An alpha particle in a single encounter:
A. Loses a small fraction of its energy
B. Losses most of its energy
C. Loses no energy at all
D. Loses all of its energy
T.V sets and microwave ovens emit:
A. X-rays
B. α-rays
C. β-rays
D. γ-rays
Alpha particle ionizes an atom:
A. Through direct collision
B. Through electrostatic attraction
C. Through electrostatic repulsion
D. All of above
The charge on alpha particles is:
A. Plus one
B. Plus two
C. Minus two
D. Minus one
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
