Question

Q3(a) Explain the function of a capacitor and resistor in an electronic device. You may choose a device which has both electrical components, or separate devices for each component (5 marks) (b) Monochromatic light from a helium-neon laser of 2. = 632.8 nm is incident on a diffraction grating containing 6000 lines/cm. (1) Analyse the number of bright fringes that can be observed. (2 marks) Calculate the angle for each bright fringe that occur (3 marks) Zoom

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Answer 1

on a) Capacitor is a device which is used to stored electrostatics energy. Resistor is used to controll the voltage and current in a circuit. The Circuit shown is of a pectifier circuit Where Capacitor is used to block doc. current resistor is is wed to take voltage and output CS Scanned with CamScanner

x Bridge Rectifier D +V D2 Load Smoothing Capacitor OV C Charges C Discharges Ripple Waveform with Capacitor Vdc 11 OvLV \ v \/ V Waveform without Capacitor

-- For light diffracted from adjacent slits to add constructively, the path difference = AC must be a whole number of wavelengths. Monochromatic light 0 BE Grating AC = AB sino and AB is the grating element = d Hence d sin 0 = na d = grating element 1 d = number of lines per metre 9

8 3) b) ;) For gratting d Sinon=na d is the gratting element d 1 cm 6000 - m 6000 10-2 ㅋ = 632-8 nm = 632-8X10-9, nmar = 10-2 = dsin on n = marimum value of Sinon=1 d a 600 X 632-8x109 107 60008632.8 = 2-634 pounding off nman = 9 So maximum numbe in so Lio -2 na d Sinon= For list bright fringe n=1 i. Sinds 632.8*109x6000 Sinds 01 = 22:31° For and bright fringe n=2 Sinon = 2 x 0-37968 = 0.75936 .: 02 = sin(0-75936) = 49.41° 10-2 37968 = Please give me a nating, help me. Comment any doubt sure help. CS Scanned with CamScanner