4. Coherent red light (fr = 4.00 × 10¹4 Hz) and blue light (fb = 6.00 × 10¹4 Hz) is shone through a diffraction grating onto a screen located from the grating. The central bright spot looks purple, and there are two other purple bright spots that appear - one at each edge of the screen. grating screen. 2m screen purple bright fringes 1= ? (a) Find the total number of red and blue (not purple) bright fringes that appear on the (b) If the spacing of the slits in the diffraction grating is 3 × 10-6 m, find the width of the screen.
4. Coherent red light (fr = 4.00 × 10¹4 Hz) and blue light (fb = 6.00 × 10¹4 Hz) is shone through a diffraction grating onto a screen located from the grating. The central bright spot looks purple, and there are two other purple bright spots that appear - one at each edge of the screen. grating screen. 2m screen purple bright fringes 1= ? (a) Find the total number of red and blue (not purple) bright fringes that appear on the (b) If the spacing of the slits in the diffraction grating is 3 × 10-6 m, find the width of the screen.
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Transcribed Image Text:4. Coherent red light (fr = 4.00 × 10¹4 Hz) and blue light (f = 6.00 × 10¹4 Hz ) is shone
through a diffraction grating onto a screen located from the grating. The central bright spot
looks purple, and there are two other purple bright spots that appear – one at each edge of
the screen.
grating
screen.
2m
purple
bright
fringes
screen
1=?
(a) Find the total number of red and blue (not purple) bright fringes that appear on the
(b) If the spacing of the slits in the diffraction grating is 3 × 10–6 m, find the width of
the screen.
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