Calculate the twisting couple on a solid shaft of length 1.5 m and diameter 120 mm when it is twisted through an angle 3º. The coefficient of rigidity for the material of the shaft may be taken to be 93 X 109 N/m2.
Define sound absorption coefficient. Define reverberation time.
The volume of room is 1500 m3. The wall area of the room is 260m2, the floor area is 140m2 and the ceiling area is 140 m2 .The average sound absorption coefficient for wall is 0.03, for the ceiling is 0.8 and for the floor is 0.06. Calculate the average absorption coefficient and the reverberation time.
Discuss various factors affecting the acoustics of buildings and give their remedies.
Explain with required circuit diagram the generation of ultrasonic waves with piezoelectric effect.
Calculate the length of an iron rod which can be used to produce ultrasonic waves of 20 KHz. Density of iron is 7.23 X 103 kg/m3 and Young’s modulus is 11.6 X 1010 N/m2.
Explain in detail the method for measuring velocity of ultrasound using acoustical grating method.
The critical temperature of Nb is 9.15 K. At zero kelvin the critical field is
What is meant by superconductivity? Describe the effect of (1) magnetic field, (2) isotope, (3) impurity, (4) current and (5) pressure on superconductors.
Calculate the critical current which can flow through a long thin superconducting wire of aluminum of 10-3 m diameter. The critical magnetic field for aluminum is 7.9 X 103 A∙m-1.
A typical laser emits a 6940 Å wavelength. Find the energy difference (in eV) between the energy levels of this laser.
What is cantilever? Write expressions for depression of cantilever when the load is fixed at the center for rectangular and circular bar.
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Official Gujarat Technological University (GTU) examination paper and step-by-step solutions for Physics (Winter 2024, B.E. · Common Engineering, Sem 1). Features complete 70-mark regular & remedial examination pattern, official marking distribution across all 5 questions, and direct 1-click official PDF download.
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