Discussion
Read the statements and select the correct option given below :
(1) EMR travels at the speed of light
(2) EMR cannot pass through vacuum
(3) EMR has two fields : Electric and magnetic
(4) The wavelength and frequency are proportional to each other
Answer: D
Statements (1) and (3) are true, so the answer is (1) and (3) are true.
Electromagnetic radiation travels at the speed of light, about 3 × 108 m/s in a vacuum (1), and it consists of electric and magnetic fields oscillating at right angles to each other and to the direction of travel (3).
Statement (2) is false: EMR needs no medium and passes through a vacuum, which is how sunlight reaches the earth. Statement (4) is false: since speed = wavelength × frequency and the speed is constant, wavelength and frequency are inversely proportional. Every option including (2) or (4) is wrong.
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