Final answer:
The device that uses sound to indicate the intensity of radiation is the 3. audible warning device, commonly known as the Geiger counter. It produces audible clicks with a frequency that increases with radiation intensity.
Step-by-step explanation:
The radiation monitoring device that indicates the intensity of radiation by the frequency or pitch of sound given off is an audible warning device. This type of device includes the well-known Geiger counter (also known as the Geiger-Müller counter). When radiation causes ionization of the gas within the Geiger-Müller tube, an electrical pulse is produced, generating audible clicks. The frequency or pitch of these clicks increases with the intensity of radiation, thus providing a real-time indication of radiation levels. Other devices, such as the film badge, thermoluminescent dosimeter, and pocket chamber, do not produce an audible signal related to radiation intensity; instead, they provide measurements after exposure.
The radiation monitoring device that indicates the intensity of radiation by the frequency or pitch of sound given off is an audible warning device. This device uses the principle of sound frequency to alert individuals to the presence of radiation. As the intensity of radiation increases, the frequency or pitch of the sound emitted by the device also increases, providing an auditory indication of the radiation intensity.