Which postulate of the cathode ray tube experiment shows that these rays comprise of negatively charged particles?

Explanation

To determine which postulate of the cathode ray tube experiment shows that these rays comprise negatively charged particles, we can follow these steps:

### Step 1: Understand the Setup of the Cathode Ray Tube
In the cathode ray tube (CRT) experiment, a glass tube is used with two electrodes: a cathode (negative plate) and an anode (positive plate). The tube is partially evacuated to create a low-pressure environment.

**Hint:** Remember that the cathode is the source of the rays, and the anode is where the rays are directed.

### Step 2: Apply High Voltage
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