Created by StemPy LabA cell sends a current of through a resistor. When the resistor is replaced by a resistor, the current becomes . The emf of the cell, in volts, is ____.
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← Two identical whistles, each sounding at 340 Hz, stand still beside a straight railway track, some distance apart. A passenger on a train moving at 10 m/s between them, from one whistle towards the other, hears both. The air is still and the speed of sound is 340 m/s. The number of beats per second the passenger hears is ____.A thin convex lens of focal length 20 cm forms a real image of an object that is twice as tall as the object. The distance between the object and its image, in centimetres, is ____. →
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