Physics Revision Flashcards
1
Q
How do you describe alternating-current
A
A voltage that fluctuates in direction continuously
2
Q
How can the student measure distance H more accurately
A
Make sure that there is no zero error
The ruler should be vertical
Use a ruler with finer calibration
3
Q
Why does radioactive substances reduce with time
A
The activity decreases due to nucleus decay
And the number of nuclei decaying per second decreases
4
Q
When measuring speed of sound what should you take away from from your results
A
Reaction time
