True or False: When a change occurs, the signal speed, wavelength, and frequency all change.

When considering the relationship between signal speed, wavelength, and frequency, it is essential to understand the principles of wave behavior, particularly in the context of radar and electromagnetic waves. The speed of a signal in a given medium is determined by the properties of that medium. In many cases, especially in a vacuum, the speed of light remains constant, approximately 299,792 kilometers per second.

When a change occurs, such as a transition from one medium to another, the speed of the wave can change. However, according to the wave equation, the relationship between speed, wavelength, and frequency is defined as:

[

\text{Speed} = \text{Wavelength} \times \text{Frequency}

]

If the speed changes, either the wavelength or frequency (or both) will adjust accordingly to maintain this relationship. However, it is not accurate to say that all three parameters (speed, wavelength, and frequency) change with every type of change in the environment. For instance, when a wave moves from air to water, while the speed definitely changes, the frequency remains constant; it is the wavelength that adjusts to accommodate the new speed.

Therefore, the statement that "when a change occurs, the signal speed, wavelength,