1.Arrange the following types of electromagnetic radiation in order of increasin

Question

1.Arrange the following types of electromagnetic radiation in order of increasing (shortest to longest) wavelength from left to right.

a)UV radiation < Red visible light < Microwaves. b)Infrared < UV radiation < Green visible light. c)X-rays < Infrared < Red visible light. d)Microwaves < Red visible light < Green visible light. e)Radio waves < Green visible light < UV radiation.

2.Which of the following statements is false?

a)Energy is directly proportional to frequency. b)Long wavelengths have low energies and low frequencies. c)Energy is inversely proportional to wavelength. d)Wavelength is directly proportional to frequency. e)Short wavelengths have high energies and high frequencies.

3.What is the frequency of a helium-neon laser light with a wavelength of 633 nm?

a)4.74 x 1014 Hz. b)4.74 x 1016 Hz. c)2.11 x 10-6 Hz. d)4.74 x 105 Hz. e)2.11 x 10-15 Hz

Explanation / Answer

1)The increasing wavelength of the different radiations is

UV < green < red < IR < microwave < radiowaves

2) The statement d is false.

We know E = h (frequency = hc /(lambda) or( wavelength)

Thus E nergy is directly proportional to frquency and inversely proportional to wavelength.

Higher the wavelength, less is energy and frequency .

3) wavelength = 633 nm = 633 x 10-9 m

We have the relation as wavelength x frequency = velocity of light

thus frequncey = c/ wavelength

= [3 x108 m/sec] / 633x10-9 m

= 4.7x1012 /sec

Related Questions

Navigate

• Browse (All)
• Browse 1
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.