When a source of sound moves faster than the speed of sound itself in that medium, it creates a conical wave front known as a: MCQ with Answer and Explanation
When a source of sound moves faster than the speed of sound itself in that medium, it creates a conical wave front known as a:
A. Transverse wave
B. Standing wave
C. Shock wave
D. Beat frequency
Answer: Option C
Solution (By JKExamLibrary)
When an object (like a jet plane) exceeds the speed of sound (Mach 1), it overtakes the sound waves it produces. These sound waves pile up behind the object, superimposing constructively to form an intense, cone-shaped pressure wave called a shock wave. When this high-pressure cone sweeps over an observer on the ground, they hear a loud 'sonic boom'.
Explanation:
A fuse is an electrical safety device consisting of a wire made of an alloy with a low melting point. If the current exceeds a safe limit (due to a short circuit or overload), the Joules heating (I²Rt) causes the wire to melt instantly, breaking the circuit and preventing fire or damage to appliances.
Explanation:
Lamination of core increases resistance to circulating eddy currents, reducing eddy current losses (I²R). Hysteresis loss reduced by using soft iron. Copper loss is in windings. Lamination is insulation between layers.
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