Two identical spherical steel balls are released from the top of two tall jars containing liquids L1 and L2 respectively. Figure 3 shows the velocity

Answer:

- Initially, the two balls accelerate through the liquid because the weight,mg>than the
sum of upthrust and viscous drag. Viscous drag however increases in velocity and so after some
times the ball attain constant velocity. The difference in the two graphs is the fact that the viscosity of L1 is greater than viscosity L2

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The control grids in a Cathode Ray Oscilloscope (CRO) is used to control the brightness of the beam on the screen. How is this achieved? (Answered)
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State two differences between the cathode ray tube (CRT) of a T.V and the cathode ray oscilloscope (CRO). .
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Figure 3 shows the main features of a cathode ray tube (CRT) of a cathode ray oscilloscope (CRO). (i) Describe how the electrons are produced in the tube. (ii) State and explain the function of the grid. (iii) State what would be observed on the screen if an a.c voltage is connected across the y-plates. (iv) State how the deflection system of a television differs from that of a CRO. .
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