27. Which is nota form of electromagnetic radiation?
28. Electromagnetic radiation is characterized by its frequency, which is the time it takes the radiation to reach an object. You Answered You Answered the number of waves that pass a given point per unit of time. Correct Answer the distance between successive wave crests. the time between successive wave crests. 0.5 / 0.5 pts Question 29 29. How are frequency and energy related? 30. How are frequency and wavelength related?
31. Which statement about ultraviolet radiation (UV) is true? 32. Organic sunscreens work by ______; inorganic sunscreens work by ______. absorbing UV; reflecting UV absorbing UV; scattering UV Correct! Correct! scattering UV; absorbing UV absorbing UV; amplifying visible light 1 / 1 pts Question 33 33. Tooth enamel is composed mainly of plaque. calcium metal. bacterial shells. a mineral based on calcium and phosphate ions. Correct! Correct!
5/2/16, 4 : 44 PM Quiz Chapter 11: CHE101-01-SP16 Page 13 of 14 1 / 1 pts Question 34 34. Abrasives are used in toothpaste to strengthen enamel. remove plaque. Correct! Correct! provide a pleasant taste. kill bacteria. 1 / 1 pts Question 35 35. Fluoride ion is used in toothpaste to strengthen enamel. Correct! Correct! remove plaque. provide a pleasant tatste. kill bacteria. 1 / 1 pts Question 36 36. Hair is composed mostly of water. dead cells. wax. protein. Correct! Correct!
5/2/16, 4 : 44 PM Quiz Chapter 11: CHE101-01-SP16 Page 14 of 14 1 / 1 pts Question 37 37. Hair care products are difficult to formulate because the scalp is more sensitive than other parts of the body. hair strands are very sensitive to harm by surfactants. the formulation must remove dirt while leaving hair glossy. Correct! Correct! government regulations are more demanding than they are for other categories of cosmetics. 1 / 1 pts Question 38 38. Which is most important in reshaping hair by a perm?
You've reached the end of your free preview.
Want to read all 14 pages?
- Spring '08
- Chemistry, Wavelength, Surface tension, Quiz Chapter