Question

Choose the incorrect statement regarding Cathode rays:

• A. Cathode rays produce X-rays
• B. Cathode rays are electromagnetic waves
• C. Cathode rays travel in a straight route
• D. Cathode rays are fast electrons

Hint:

Cathode rays are streams of fast-moving electrons, not electromagnetic waves. They travel in straight lines unless influenced by electric or magnetic fields.

Answer 1

The Correct Option is B

Step 1: Understanding cathode rays. Cathode rays are streams of high-speed electrons emitted from the cathode in a vacuum tube. They possess mass and negative charge and exhibit particle-like properties. 

Step 2: Evaluating given statements. - (A) Cathode rays produce X-rays: Correct. When cathode rays strike a metal target, X-rays are generated due to energy conversion. 
- (B) Cathode rays are electromagnetic waves: Incorrect. Cathode rays are not electromagnetic waves; they are charged particles (electrons). Electromagnetic waves (like X-rays) have no charge or mass. 
- (C) Cathode rays travel in a straight route: Correct. In the absence of external magnetic or electric fields, cathode rays move in straight lines. 
- (D) Cathode rays are fast electrons: Correct. They consist of negatively charged high-speed electrons moving from the cathode to the anode. 

Conclusion. Since cathode rays are not electromagnetic waves, option (B) is incorrect, making it the correct answer for this question.