Q7 of 26 Page 1

A ray PQ incident normally on the refracting face BA is refracted in the prism BAC made of material of refractive index 1.5. Complete the path of ray through the prism. From which face will the ray emerge? Justify your answer.

Now here since light is going from one medium to another (air to glass), refraction is taking place in case of refraction we use sell’s law according to which


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5

The plot of the variation of potential difference across a combination of three identical cells in series, versus current is shown below. What is the emf and internal resistance of each cell?

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Define modulation index. Why is it kept low? What is the role of a bandpass filter?

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Calculate the de-Broglie wavelength of the electron orbitting in the n = 2 state of hydrogen atom.

 9

Define ionization energy.

How would the ionization energy change when electron in hydrogen atom is replaced by a particle of mass 200 times that of the electron but having the same charge?


OR


Calculate the shortest wavelength of the spectral lines emitted in Balmer series. [Given Rydberg constant, R = 107 m-1]