6. Which type of electromagnetic radiation has the longest wavelength?
a) Radio waves
b) Microwaves
c) X-rays
d) Gamma rays
Answer: a) Radio waves
7. What is the unit of measurement for the frequency of light?
a) Hertz (Hz)
b) Newton (N)
c) Pascal (Pa)
d) Watt (W)
Answer: a) Hertz (Hz)
8. What is the unit of measurement for the intensity of light?
a) Candela (cd)
b) Newton (N)
c) Pascal (Pa)
d) Watt (W)
Answer: a) Candela (cd)
9. What is the unit of measurement for the amount of light energy per unit area per unit time?
a) Watt (W)
b) Joule (J)
c) Lux (lx)
d) Lumen (lm)
Answer: c) Lux (lx)
10. What is the unit of measurement for the total amount of light energy emitted per second by a light source?
a) Watt (W)
b) Joule (J)
c) Lux (lx)
d) Lumen (lm)
Answer: d) Lumen (lm)
