The cracking sound heard when dry hair is combed with a hard rubber comb is due to_________?
Correct answer: B. Small electric sparks
- A. The hair barging against the charged comb
- B. Small electric sparks
- C. The rubbing of the comb with the hair
- D. None of the above
Explanation
Rubbing the rubber comb against dry hair transfers electric charges to the comb and hair. The sudden discharge of these charges produces tiny sparks and the cracking sound.
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