Relation between frequency and time:  Frequency is inversely proportional to time.

                     f=1/t.

Units of frequency:  The units will be in hertz.

1 hertz=1 cycles per second.

1 kilo hertz=1000 cycles per second.

1 mega hertz=1,000,000 cycles per second.

1 giga hertz=1,000,000,000 cycles per second.

1 tera hertz= 1,000,000,000,000 cycles per second.

Types of frequency:  

Angular frequency:  It is denoted by omega.

Rate of change of angular displacement.

Spatial frequency:  Time axis is replaced by one or more spatial displacement axes.

Natural frequency:  The frequencies at which an object tends to vibrate with when hit, struck, plucked, strummed or somehow disturbed. 

Interaction frequency:  It refers to no of social interaction per unit time.

Negative frequency:  It represent forward travelling waves.

Positive frequency:  It represent backward travelling waves.

Ranges of frequency:

Notes: