4.6. Uses of an oscilloscope
A subsection of Physics, 5054, through 4. Electricity and magnetism
Listing 10 of 17 questions
shows the basic structure of a cathode-ray oscilloscope (c.r.o.). Some parts are missing. – + filament anode glass tube screen Electrons are emitted from the filament by thermionic emission. Explain what is meant by thermionic emission. Electrons hit the screen at high speed. Explain how the electrons are made to travel at high speed. The spot on the screen is made to move up and down and also across the screen. The parts of the c.r.o. that make this happen are not shown in . On , draw and label the parts that are needed.
5054_s15_qp_21
THEORY
2015
Paper 2, Variant 1
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A microphone is connected to a cathode-ray oscilloscope (c.r.o.). A note produced by a musical instrument causes a trace on the screen. The trace is stored electronically in the c.r.o. shows the stored trace displayed on the screen. timebase Y-gain Oscilloscopes CIE 1 division microphone The timebase setting on the oscilloscope is 0.20 ms / division. Determine the frequency of this note. frequency = A note from a second musical instrument is played and the trace S produced by the new note is also displayed on the screen. shows the screen displaying both the original trace and S. 1 division S In each of the three spaces below, describe either a similarity or a difference between the sounds made by the two notes. 1. 2. 3.
5054_w10_qp_22
THEORY
2010
Paper 2, Variant 2
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EITHER The main part of a cathode-ray oscilloscope consists of a glass tube. At one end of the tube, electrons are emitted by a hot metal filament. State two requirements for there to be a continuous flow of electrons in the tube. 1. . 2. . A microphone detects two pulses of sound. The output is displayed on the screen of an oscilloscope. shows how the voltage output of the microphone varies with time. voltage time Describe how the time between the two pulses can be determined using the display on the screen of the oscilloscope. OR Many electronic and digital circuits include logic gates. The NAND gate is a type of logic gate. In the space below, draw the circuit symbol for a NAND gate. The two input terminals of a NAND gate are connected to zero voltage (logic state 0) and no energy is supplied to these terminals. The output of the NAND gate is connected to an LED (light-emitting diode). The output is not zero (it has a logic state of 1) and the LED is glowing brightly. Energy is supplied to the LED by the NAND gate. State where this energy comes from. Complete the truth table for a NAND gate. inputs output
5054_w17_qp_21
THEORY
2017
Paper 2, Variant 1
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Questions Discovered
17