Unit of Length: Micrometer (μm)
Unit of Time: Microsecond (μs)
To determine the unit of velocity, we can use the formula:

Velocity = Distance / Time

Given that the unit of length is micrometer and the unit of time is microsecond, we can substitute these values into the formula:

Velocity = Distance (in micrometers) / Time (in microseconds)

Simplifying the equation, we have:

Velocity = Micrometers / Microseconds

This means that the unit of velocity will be micrometers per microsecond (μm/μs).

Explanation:
The unit of velocity is determined by dividing the unit of length by the unit of time. In this case, since the unit of length is micrometer and the unit of time is microsecond, the resulting unit of velocity is micrometers per microsecond (μm/μs).

The micrometer (μm) is a unit of length that is equal to one millionth of a meter. It is commonly used to measure very small distances, such as the size of cells or microscopic structures.

The microsecond (μs) is a unit of time that is equal to one millionth of a second. It is often used to measure very short time intervals, such as the duration of electronic signals or the speed of computer processors.

When we divide a distance in micrometers by a time in microseconds, the resulting value represents the velocity in micrometers per microsecond. This unit indicates how far an object travels in micrometers during each microsecond of time.

In summary, the unit of velocity when the unit of length is micrometer and the unit of time is microsecond is micrometers per microsecond (μm/μs).