Two microwave transmitters emitting coherent waves produce maximum readings at X, Y and Z.
a) Calculate their wavelength.(2)
b) Explain how maxima are produced.(1)
a) Calculate the wavelength of the laser light.(3)
b) What colour is the light?(1)
c) The light is monochromatic. What does this mean?(1)
a) Calculate the refractive index of the glass.(2)
b) The wavelength in air is 550 nm. Calculate the wavelength of the light in the glass.(2)
c) What happens to the frequency as it travels from air to glass?(1)
A lamp produces an irradiance of 48 W/m2 at a distance of 6 m. Calculate the irradiance produced at 12 m.(2)
"; T[5]="a) How many spectral lines could this atom produce?(1)
b) Which energy transition would produce the shortest wavelength?(1)
c) What is the work function of a surface? (1)
In which mode is this photodiode operating?(1)
"; T[7]="Draw the circuit symbol for a MOSFET.(1)
"; T[8]="a) What type of nuclear reaction is this?(1)
b) Calculate the loss in mass.(3)
c) Calculate the energy released.(2)
A gamma source produces 128 mSvhr-1. Lead shielding has a half value thickness of 25 mm. Calculate the thickness required to produce an equivalent dose of 4 mSvhr-1.(2)
"; T[10]="A nuclear worker is exposed to 30 mGy of alpha particles, 400 mGy of beta particles and 300 mGy of Gamma radiation. Calculate her total equivalent dose.(4)
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