Electromagnetic spectrum frequency order

Steps:

• Recall EM waves ordered by decreasing frequency: gamma rays (highest), X-rays, ultraviolet, visible light, infrared, microwaves, radio waves (lowest).
• Identify key types in choices: gamma rays > ultraviolet > infrared > radio waves.
• Eliminate choices with reversed or incorrect sequences.
• Select matching decreasing order.

Why B is correct:

• B follows the EM spectrum law where frequency decreases from gamma rays (10^19 Hz) to ultraviolet (10^15 Hz), infrared (10^13 Hz), and radio waves (10^6 Hz).

Why the others are wrong:

• A: Places infrared before ultraviolet, but ultraviolet has higher frequency than infrared.
• C: Starts with radio waves (lowest frequency), showing increasing order instead of decreasing.
• D: Begins with radio waves as highest frequency, reversing the spectrum entirely.

Final answer: B