Table of Content
4.1 Thermionic Emission and Cathode Ray 4.2 Carthode Ray Oscilloscope 4.3 Semiconductor	4.4 Semiconductor Diode 4.5 Trasistor 4.6 Logic Gate

Cathode Ray Oscilloscope

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Display on the screen of an oscilloscope

1) The diagram shows a trace on a cathode ray oscilloscope (CRO). Which of the following statement is true about the signal displayed and the setting of the CRO?

This is an alternating current.
The time base is off
The voltage is 2V

	I and II only
	I and III only
	II and III only
	I, II and III

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2) The diagram shows a trace on an oscilloscope. The Y-gain control of the cathode-ray oscilloscope is set to 5V/div. What is the root mean square voltage of the signal?

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3) The diagram shows a trace on an oscilloscope. The time-base of cathode-ray oscilloscope is set to 5 ms/div. What is the frequency of the signal?

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4) Figure above shows a waveform of an alternating current on the screen of a cathode ray oscilloscope. The Y-gain control is set to 5V/div. Find the peak voltage of the alternating current.

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5) Diagram above shows the internal structure of a cathode ray oscilloscope. Name the parts Q, R and S in the electron gun.

Q	R	S
Focusing Anode	Control Grid	Accelerating Anode
Control Grid	Accelerating Anode	Focusing Anode
Control Grid	Focusing Anode	Accelerating Anode
Cathode	Focusing Anode	Accelerating Anode

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6) Which part of the cathode ray oscilloscope controls the brightness of the light spot on the screen?

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7) Figure above shows a sonar signal recorded on a cathode ray oscilloscope (CRO) when it is emitted by a ship and reflected back by the seabed. Given that the time base of the CRO is set to 100ms/div, find the depth of the sea beneath the ship. (The speed of sonar wave in sea is 1500ms-1)

Magnetic Field
A magnetic field is a region in the surrounding of a magnet which a magnetic material experiences a detectable force.