An Electrical Spark,such as Lightning,generates Electromagnetic Radiation Over a Wide

question 152

Multiple Choice

An electrical spark,such as lightning,generates electromagnetic radiation over a wide range of wavelengths.How much longer will a pulse of radio energy take to travel between two detector stations 100 m apart than will a pulse of ultraviolet radiation from the same spark?

• A) The time will be identical because both pulses travel at the speed of light.
• B) The time will be just a little longer because the high-frequency UV radiation travels faster than the low-frequency radio waves.
• C) The time will be much shorter because long-wavelength radiations travel faster.
• D) The time will be much longer because radio waves have much longer wavelengths and therefore travel more slowly.

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