Circle the Roman numeral corresponding to the best answer for each questions bel

Question

Circle the Roman numeral corresponding to the best answer for each questions below. Which type of wave travels the slowest through a vacuum? a gamma ray a radio wave a microwave an x-ray all of the above; they all travel at the same speed. none of the above; these waves cannot travel through a vacuum Which frequency below could be that of infrared light? 1 times 10^-6 Hz 1 Hz 1 times 10^7 Hz 1 times 10^14 Hz all of the above; they all could be infrared light. none of the above. Which wavelength below could be that of a radio wave? 6 times 10^-8 m 6 times 10^-7 m 6 times 10^-6 m 6 m all of the above; they all could be radio waves. none of the above. Visible light consists of an electric field only. a gravitational field only. a magnetic field only. electric, gravitational, and magnetic fields perpendicular to c none of the above.

Explanation / Answer

a] All the above mentioned waves are electromagnetic waves and an electromagnetic waves travel at the same speed in vacuum. Hence the answer is [v]

b] Wavelength of Infrared radiation is between 900 nm to 3000 nm

900nm to 3000 nm corresponds to a frequency of the order of 1014 Hz therefore the answer is [iv].

c] Wavelength of Radiowaves is between 1mm to 100 km. Hence the answer is [iv].

d] Visible light consists of oscillating Electric field and a magnetic field but not a gravitational field. Hence the answer is [v].

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