Iris

Q. Light is the ___ that can be detected by the human eye.

1. electromagnetic radiation
2. longitudinal wave
3. pulse
4. electric field

Q.

Which of the following has the weakest carbon-carbon bond strength?

1. $C_2{H}_2$

2. $C_2{H}_4$

3. $C_2{H}_6$

4. $C_2{H}_8$

Q.

Hot iron emits ______ rays which are _______ to the eyes.

1. infrared, visible

2. ultraviolet, visible

3. infrared, invisible

4. ultraviolet, invisible