Which statement about electromagnetic waves is correct?A A wave of wavelength 5.0 10 –6 m is invisible to the human eye.B They can all travel at different speeds in free space.C They cannot be polarised.D They consist of vibrating atoms.
Question
Which statement about electromagnetic waves is correct?A A wave of wavelength 5.0 10 –6 m is invisible to the human eye.B They can all travel at different speeds in free space.C They cannot be polarised.D They consist of vibrating atoms.
Solution
The correct statement about electromagnetic waves is A. A wave of wavelength 5.0 × 10 –6 m is invisible to the human eye.
Here's why:
A. This statement is correct. The human eye can only see light waves in the visible spectrum, which ranges from about 400 to 700 nanometers (or 4.0 × 10^-7 to 7.0 × 10^-7 meters). A wavelength of 5.0 × 10^-6 meters falls in the infrared range, which is invisible to the human eye.
B. This statement is incorrect. All electromagnetic waves travel at the same speed in free space, which is the speed of light (approximately 3.0 × 10^8 meters per second).
C. This statement is incorrect. Electromagnetic waves can be polarized. Polarization is a property of waves that can oscillate with more than one orientation.
D. This statement is incorrect. Electromagnetic waves are not made up of vibrating atoms. They are composed of oscillating electric and magnetic fields.
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