Which of the following is not an electromagnetic wave ?
ABeta rays
BGamma rays
CX rays
DLight rays
Answer:
A. Beta rays
Read Explanation:
- Electromagnetic (EM) waves are oscillations of electric and magnetic fields that propagate through space without the need for a medium.
- The electromagnetic spectrum includes, in increasing order of frequency: Radio waves, Microwaves, Infrared, Visible light, Ultraviolet, X-rays, and Gamma rays.
- Sound waves are classified as mechanical waves because they require a material medium (solid, liquid, or gas) to travel and are caused by the vibration of particles.
- Key differences between EM waves and mechanical waves:
- Propagation: EM waves can travel through a vacuum, while mechanical waves cannot.
- Nature: EM waves are always transverse, whereas mechanical waves can be either transverse (like waves on a string) or longitudinal (like sound waves).
- Speed: All EM waves travel at the speed of light (approximately 3 x 108 m/s) in a vacuum, whereas the speed of sound is significantly slower and depends on the density and elasticity of the medium.