11.What is the power factor of a series LCR circuit ?
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12.For observing Fraunhofer diffraction from a single slit, what type of wave front should be incident on the slit ?
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13.A ray of light falls on a right angled prism ABC (AB = BC) and travels as shown in Fig. below. What is the refractive index of the material of the prism ?
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14.A simple microscope or a magnifying glass with a focal length 5 cm forms an image at the near point of the eye. Find its magnification.
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15.How can a pile of glass plates be used to produce polarised light ?
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16.State two basic differences between primary and secondary rainbows.
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17.A radio transmitter operates on a wavelength of 1500 m at a power of 400 kW. Find the energy of the radio photons in joules.
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18.
The radius of the first orbit of the electron of a hydrogen atom is 5.3 x 10-11 m. What is the radius of its second orbit ?
It is a p-n junction diode made of gallium-arsenic as semiconductor.
It is forward biased arrangement due to combination of holes and electrons, energy is released at the junction which is emitted as light. So, it is known as the light emitting diode.
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