Which of the following electromagnetic waves is visible?

1.   ?    radio waves
2.   ?    infra-red
3.   ?    visible light
4.   ?    ultraviolet

Which of the following statements about waves in the electromagnetic spectrum is INCORRECT?

1.   ?    They can all be detected by human eyes
2.   ?    They all travel at the same speed in a vacuum
3.   ?    radio waves are low frequency waves
4.   ?    Some waves are used for communications

Which of the following electromagnetic waves has highest frequency?

1.   ?    gamma rays
2.   ?    X-ray
3.   ?    radio waves
4.   ?    microwaves

Which of the following electromagnetic waves has highest energy?

1.   ?    Gamma ray
2.   ?    X ray
3.   ?    Ultra-violet
4.   ?    Visible light

What is the simarility between infra-red and ultra-violet radiations?

1.   ?    They have the same colours
2.   ?    They have the same energies
3.   ?    They have the same wavelengths
4.   ?    They have the same speeds