Directions: Read each item carefully. Write only the letter of your choice. Use a separate sheet of paper for your answers.

1. This type of wave was discovered by famous astronomer Sir Frederick William Herschel and has a range of [tex]$7 \times 10^{-7} \, \text{m} - 1 \times 10^{-5} \, \text{m}$[/tex].
a. infrared
b. microwave
c. radio wave
d. visible light

2. Which of the following electromagnetic waves has the least wavelength range?
a. infrared ([tex]$7 \times 10^{-7} \, \text{m} - 1 \times 10^{-3} \, \text{m}$[/tex])
b. x-ray ([tex]$1 \times 10^{-11} \, \text{m} - 1 \times 10^{-8} \, \text{m}$[/tex])
c. visible light ([tex]$6.22 \times 10^{-7} \, \text{m} - 4.55 \times 10^{-7} \, \text{m}$[/tex])
d. ultraviolet ([tex]$1 \times 10^{-8} \, \text{m} - 4 \times 10^{-7} \, \text{m}$[/tex])

3. Which among the following EM waves has the longest wavelength?
a. infrared
b. ultraviolet
c. visible light
d. x-ray

4. Which electromagnetic wave can travel the farthest distances because it has a wavelength range of greater than [tex]$1 \times 10^{-1} \, \text{m}$[/tex]?
a. gamma ray
b. microwave
c. radio wave
d. x-ray

5. The wavelength of microwaves ranges from [tex]$1 \times 10^{-1} \, \text{m}$[/tex] to [tex]$1 \times 10^{-3} \, \text{m}$[/tex]. Which of the following has size comparable to the wavelength of microwave?
a. Bacteria
b. Coin
c. Human
d. Pin