9) Mike goes to his favorite fast food restaurant, he sces in the k tetitn war w

Question

9) Mike goes to his favorite fast food restaurant, he sces in the k tetitn war wat type of clectromagnetic waves does this 1amp use to keep the food warn A) Visible light B) Radio waves C) Infrared radiation D) Gamma radiation E) Ultra violet radiation 10) A typical cell phone e transpits at a frequency of 850 MEHz (830 x 10 Hz), what is the signals wavele a A) 0.942 m B) 0.241 m C) 0.002 m D) 0.047 m 0.353rm (11))The main difference between radio waves and visible light waves traveling in a vacuum is there A) speed - B) modulation C) frequency D) all of these E) A and C only 2) Which one of the following lists gives the correct order of the electromagnetic spectrum from A) gamma rays, x-rays, visible, ultraviolet, microwaves, infrared, radio waves B) radio waves, ultraviolet, x-rays, microwaves, infrared, visible, gamma rays radio waves, microwaves, visible, x-rays, infrared, ultraviolet, gamma rays D radio waves, microwaves, infrared, visible, ultraviolet, x-rays, gamma rays gamma rays, x-rays, ultraviolet, visible, infrared, microwaves, radio waves y has a special camera that can "sce any wavelength of the electromagnetic spect looking at a rock that is emitting a peak wavelength of 1 um (1 x 10 m), what temperature is the ro 1 L3) Cath A) 3,600 K B) 3,200 K C) 2,900 K D) 4,700 K E) 5,000 K 14) Bob is listening to his favorite radio station that is 2 km (2,000 m) from his house Watts of power to transmit its radio signal, what is the rms electric field strength of the em radi from the radio station? A) 0.274 N/C B) 0.621 N/C C) 1.63 N/C D) 12.2 N/C E) 10.8 NC 3 of 7

Explanation / Answer

11. Since the medium in which waves are travelling is fixed(vaccum). The speed of both electromagnetic waves i.e radio and visible light is same. The frequency is different. Therefore answer is (c)

12. According to wein's law

Peak wavelength = b/T

Where T is temperature in Kelvin and b=2900 micrometer*kelvin

Peak wavelength = 1 micrometer (given)

Putting values we get T= 2900K

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