9 Mike goes to his favorite fast food restaurant, he sees in the kitchen, hambur

Question

9 Mike goes to his favorite fast food restaurant, he sees in the kitchen, hamburgers and French fries und ep them warm, what type of electromagnetic waves does this lamp use to keep the food warm? A) Visible light B) Gamma radiation Radio waves D) Infrared radiation E) Ultra violet radiation 10) A typical cell phone transmits at a frequency of 850 MHz (850 x 10% Hz), what is the signals wavelength A) 0.353 m B) 0.241 m C) 0.942 m D) 0.047 m E) 0.002 m 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. 12) Which one of the following lists gives the correct order of the electromagnetic spectrum from Lowest to highest Energy?

Explanation / Answer

10)

V = f lambda

Wavelength, lambda = v / f = (3 x 10^8)/(850 x 10^6)

Wavelength, lambda = 0.353 m

Correct answer is option (A)

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