Directions: Read the passage and fill up the blanks with suitable options. One of the characteristics of light is that it behaves like a __ (44) __. As a result, light can be defined by its wavelength and __ (45) __. The frequency is how fast the wave vibrates or goes up and __ (46) __. The wavelength is the distance between two peaks of the wave. Frequency and __ (47) __ are inversely related, meaning that a low frequency wave has a __ (48) __ wavelength and vice versa.

• A. ball                  
• B.          wave          
• C. Drum              
• D.          bat