Describe how the angle between the first order images was measured. What formula did you use to calculate the wavelength of the light? the data, calculate the wavelength of the monochromatic light. Give one precaution that you took to get an accurate result. Calculate the maximum number of images that are formed on the screen. The light source is replaced with a source of white light and a series of spectra are formed on the screen. Explain how the diffraction grating produces a spectrum. Explain why a spectrum is not formed at the central (zero order) image. The values for the angles on one side of the central image can sometimes be smaller than the all corresponding ones on the right. Suggest a possible reason for this. What effect each of the following changes have on the bright images formed: a monochromatic light source of longer wavelength using a diffraction grating having 200 lines per mm using a source of white light instead of monochromatic light? 2009 Section B An interference pattern is formed on a screen when light from a laser passes normally through a diffraction grating. The grating has 80 lines per mm and the distance from the grating to the screen is 90 cm. The distance between the third order images is 23.8 cm. Calculate the wavelength of the green light. TO MEASURE THE RESISTIVITY OF THE MATERIAL OF A WIRE HL: 2009, 2004 OL: 2010, 2005 In an experiment to measure the resistivity of nichrome, the resistance, the diameter and appropriate length of a sample of nichrome wire were measured. The following data were recorded: Resistance of wire = 7.9 Ω Length of wire = 54.6 cm Average diameter of wire = 0.31 mm Describe how the student measured the resistance of the wire. Describe the procedure used in measuring the length of the sample of wire. the data, calculate the diameter of the wire. Hence calculate the cross-sectional area of the wire. What instrument did the student use to measure the diameter of the wire? Why did the student measure the diameter of the wire at different places?
Describe how the angle between the first order images was measured. What formula did you use to calculate the wavelength of the light? the data, calculate the wavelength of the monochromatic light. Give one precaution that you took to get an accurate result. Calculate the maximum number of images that are formed on the screen. The light source is replaced with a source of white light and a series of spectra are formed on the screen. Explain how the diffraction grating produces a spectrum. Explain why a spectrum is not formed at the central (zero order) image. The values for the angles on one side of the central image can sometimes all be smaller than the corresponding ones on the right. Suggest a possible reason for this. What effect each of the following changes have on the bright images formed: a monochromatic light source of longer wavelength using a diffraction grating having 200 lines per mm using a source of white light instead of monochromatic light? 2009 Section B An interference pattern is formed on a screen when light from a laser passes normally through a diffraction grating. The grating has 80 lines per mm and the distance from the grating to the screen is 90 cm. The distance between the third order images is 23.8 cm. Calculate the wavelength of the green light. TO MEASURE THE RESISTIVITY OF THE MATERIAL OF A WIRE HL: 2009, 2004 OL: 2010, 2005 In an experiment to measure the resistivity of nichrome, the resistance, the diameter and appropriate length of a sample of nichrome wire were measured. The following data were recorded: Resistance of wire = 7.9 Ω Length of wire = 54.6 cm Average diameter of wire = 0.31 mm Describe how the student measured the resistance of the wire. Describe the procedure used in measuring the length of the sample of wire. the data, calculate the diameter of the wire. Hence calculate the cross-sectional area of the wire. What instrument did the student use to measure the diameter of the wire? Why did the student measure the diameter of the wire at different places?
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