Question

Waves are created on the surface of water when we drop a stone into it. Similarly you must have seen

the waves generated on a string when both its ends are held in hand and it is shaken. Light is also a type

of wave called the electromagnetic wave. Gamma rays, X-rays, ultraviolet rays, infrared rays, microwaveand radio waves are all different types of electromagnetic waves. Astronomical objects emit these waves

and we receive them using our instruments. All our knowledge about the universe has been obtained

through these waves. Gravitational waves are a very different type of waves. They have been called the

waves on the fabric of space-time. Einsteine predicted their existence in 1916. These waves are very

weak and it is very difficult to detect them. Scientists have constructed extremely sensitive instruments to

detect the gravitational waves emitted by astronomical sources. Among these, LIGO (Laser

Interferometric Gravitational Wave Observatory) is the prominent one. Exactly after hundred years of their

prediction, scientists detected these waves coming from an astronomical source. Indian scientists have

contributed significantly in this discovery. This discovery has opened a new path to obtain information

about the Universe.

i. Which type of wave a light ray is ? (1 marks)

ii. What type of rays are Gravitational waves called ? (1 marks)

iii. Why are the gravitational waves difficult to detect ? (1 marks)

iv. Give any four examples of electromagnetic waves. (2 marks)​

Answer 1

Answer:

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