Question

Which of the following statements is not true for a beam of LASER?
(A) It is an electromagnetic radiation
(B) It is highly monochromatic
(C) It travels with a speed of light
(D) It cannot travel in Vacuum

Answer 1

For answering this question we should know that a beam of laser is an electromagnetic wave, so it has the properties of an electromagnetic wave. Comparing its properties with the given option we can find which option is not true for a beam of light.

Complete Step By Step Answer:
Electromagnetic radiation, which includes visible light, radio waves, gamma rays, and X-rays, is described as a type of radiation in which electric and magnetic fields change at the same time.
The term laser light refers to a far greater range of the electromagnetic spectrum than only the visible spectrum, encompassing everything from ultraviolet to far-infrared. As a result, a laser beam emits electromagnetic radiation.
A light beam with a single wavelength is referred to as monochromatic light. The energy, wavelengths, and hues of photons emitted by natural light sources are diverse. Lasers have many qualities in common with monochromatic lasers. As a result, it's rather monochromatic.
Lasers do travel with the speed of light.
Since it is an electromagnetic wave it can easily travel in a vacuum. As it is a property of the electromagnetic wave.
Hence, option D) it cannot travel in vacuum is not true for a beam of laser and is the correct option.

Note:
Laser stands for light amplification by stimulated emission of radiation. lasers are coherent, monochromatic, and have high intensity. The laser emits light in a particular direction only. Laser light contains only a single wavelength, that is it has one specific color.