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Figure 32.4 The electromagnetic spectrum. The frequencies and wavelengths found in nature extend over such a wide range that we have to use a logarithmic scale to show all important bands. The boundaries between bands are somewhat arbitrary. Wavelengths in m 10 1 10-1 10-2 10-3 104 10-5 10-6 10-7 10-8 10-9 1o-10 10-11 10-12 10-13 Radio,> - Infrared TV X rays -Microwave- Ultraviolet > Gamma rays - 108 10° 1010 10!" 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 Visible light Frequencies in Hz 700 nm 650 600 550 500 400 nm| 450 RED ORANGE YELLOW GREEN BLUE VIOLET

Figure 32.4 The electromagnetic spectrum. The frequencies and wavelengths found in nature extend over such a wide range that we have to use a logarithmic scale to show all important bands. The boundaries between bands are somewhat arbitrary. Wavelengths in m 10 1 10-1 10-2 10-3 104 10-5 10-6 10-7 10-8 10-9 1o-10 10-11 10-12 10-13 Radio,> - Infrared TV X rays -Microwave- Ultraviolet > Gamma rays - 108 10° 1010 10!" 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 Visible light Frequencies in Hz 700 nm 650 600 550 500 400 nm| 450 RED ORANGE YELLOW GREEN BLUE VIOLET

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If the planes of a crystal are 3.50 Å (1 Å = 10-10 m = 1 Ångstrom unit) apart, (a) what wavelength of electromagnetic waves is needed so that the first strong interference maximum in the Bragg reflection occurs when the waves strike the planes at an angle of 22.0°, and in what part of the electromagnetic spectrum do these waves lie? (See Fig). (b) At what other angles will strong interference maxima occur?

Figure 32.4 The electromagnetic spectrum. The frequencies and wavelengths found in nature extend over such a wide range that we have to use a logarithmic scale to show all important bands. The boundaries between bands are somewhat arbitrary. Wavelengths in m 10 1 10-1 10-2 10-3 104 10-5 10-6 10-7 10-8 10-9 1o-10 10-11 10-12 10-13 Radio,> - Infrared TV X rays -Microwave- Ultraviolet > Gamma rays - 108 10° 1010 10!" 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 Visible light Frequencies in Hz 700 nm 650 600 550 500 400 nm| 450 RED ORANGE YELLOW GREEN BLUE VIOLET
Transcribed Image Text:Figure 32.4 The electromagnetic spectrum. The frequencies and wavelengths found in nature extend over such a wide range that we have to use a logarithmic scale to show all important bands. The boundaries between bands are somewhat arbitrary. Wavelengths in m 10 1 10-1 10-2 10-3 104 10-5 10-6 10-7 10-8 10-9 1o-10 10-11 10-12 10-13 Radio,> - Infrared TV X rays -Microwave- Ultraviolet > Gamma rays - 108 10° 1010 10!" 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 Visible light Frequencies in Hz 700 nm 650 600 550 500 400 nm| 450 RED ORANGE YELLOW GREEN BLUE VIOLET
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