B: 79
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Energy is released in some power stations and in the Sun by either nuclear fission or nuclear fusion. Which type of n…
A school keeps radioactive sources for use in radioactivity experiments in a laboratory. The background radiation is …
Which nuclides have the same number of neutrons in a nucleus?
A guitar string is made to vibrate. What makes the pitch of the note rise?
A teacher sticks a magnet to the top surface of a match-box cover. The bottom surface is placed in a small tray of ir…
The diagrams show a small compass close to a strong bar magnet. Which diagram shows the correct compass direction?