Pick out of the correct statement:
In a a cathode ray tube cathode rays

Options

A. move from cathode to anode
B. move from anode to cathode
C. are made up of photons
D. none of these

Explanation

To determine the correct statement regarding cathode rays in a cathode ray tube (CRT), we can analyze the given options step by step.

### Step 1: Understand the components of a cathode ray tube
A cathode ray tube consists of two main electrodes: the cathode (negative electrode) and the anode (positive electrode). When a voltage is applied, electrons are emitted from the cathode.

**Hint:** Remember that the cathode is negatively charged and the anode is positively charged.

### Step 2: Analyze the direction of cathode rays
Cathode rays are streams of electrons that are emitted from the cathode. Since electrons are negatively charged, they are attracted to the positively charged anode. Therefore, the direction of cathode rays is from the cathode to the anode.

**Hint:** Think about the attraction between opposite charges; this will help you determine the direction of the electron flow.

### Step 3: Evaluate the statements
1. **Move from cathode to anode**: This statement is correct because, as established, electrons (cathode rays) move from the negatively charged cathode to the positively charged anode.
2. **Move from anode to cathode**: This statement is incorrect because electrons do not move from the anode to the cathode; they move in the opposite direction.
3. **Are made up of photons**: This statement is also incorrect because cathode rays consist of electrons, not photons.
4. **None of these**: Since we have already identified a correct statement, this option is not valid.

### Conclusion
The correct statement is that cathode rays move from the cathode to the anode.

**Final Answer:** The correct statement is: "In a cathode ray tube, cathode rays move from cathode to anode."

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