Radio waves
X-rays
Infra-red
Blue light
Ultraviolet
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Correct Ans: B
Simple Mnenomic i used to Master this is:
RIVUXG
Radio waves---Infra red---Visible Light---Ultra Violet---X-ray---Gamma ray
For WAVELENGHT:
As it is going this way 
Wavelength Increases (Shortest to Longest)
As it is going this way 
Wavelength Decreases (Longest to Shortest)
While for FREQUENCY:
As it is going this way Frequency Increases (Longest to Shortest)
As it is going this way Frequency Decreases(Shortest to Longest)
I hope this would help everyone writing Jamb this year and nearer years to come
You all would come out with Distinctions 
The answer is B. Check New School Physics pg 372.
EM waves arranged in order of increasing wavelength and decreasing frequency are:
Gamma rays, X-rays, ultraviolet rays, visible light, infrared rays, microwaves, and radio waves.
just us this mnemonic
give gamma
xanthosis X-ray
umbrella ultra violet ray
video visible light
in infrared
my microwave
room radio waves
increasing wavelength going 👇
my school app is very correct
the answer is meant to be Gramma ray because it's the shortest. but it's not part of the option and the second shortest is X-ray
