Question

Q1

i) : Dealing with atmospheric pressure, if one observes the Mercury level rises to 70 cm. Predict the atmospheric pressure of the air in mm of Hg. Can you represent it in bar? How can you evaluate the height of the Mercury column in a perfect barometer for standard pressure? Comparing both results, evaluate the percentage difference. Water is used instead of Mercury in a perfect barometer, can you assess the volume of water in SI unit, if cross section area of the barometer tube is 2.5 cm2. (5.0 Marks)

ii) A positive charge consisting of 40 protons is moving in a circular orbit of circumference 90 cm in a uniform magnetic field of 0.40 T. Can you predict in which direction the given magnetic field should be applied in this system to maintain circular motion? If this charge particle is revolving in this magnetic field, validate the magnitude of linear speed of the charge particle. How can you make the inference about the effects on linear speed when a negative charge particle consisting of 40 electrons is moving?

(5.0 Marks)

iii) Electromagnetic waves are produced by oscillating accelerated particle. Give the reason, why electromagnetic waves have more application than the non-electromagnetic waves? An EM radiation coming out when a TV remote is switched on. Now, if it starts propagating from vacuum into water, it is assumed that its speed is reduced to half, predict its wavelength in water and justify your result. Compare and validate your results for a radiation coming out from an X-ray machine. Compare the effects on frequency of both EM waves when there is a change in medium. Justify your findings. (5.0 Marks)

Answer 1

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