Question

C9 Consider a charge particle detection chamber as shown in the figure below. The chamber is made of a set of parallel plates separated by 20 mm distance and connected to the external resistance (R = 100 $\Omega$) as shown in the figure along with the high voltage power supply of 1 kV. $\uparrow$ 4 mm 20 mm R = 1000 $V_R$ $V_o$=1 kV The chamber is filled with Argon (Ar) gas (ionization energy 16 eV). If a charged particle passes through the chamber and loses sufficient energy, it ionizes the Ar atoms and generates a small voltage pulse across the resistance R. In an experiment, an alpha particle of energy 5.5 MeV enters the chamber at a distance of 4 mm from the bottom plate, as shown, generating ion-electron pairs. If the effective capacitance of the chamber is 100 pF, the measured voltage pulse shape would be best described as: (a) A sharp voltage pulse followed by a very weak broad pulse (b) Two sharp voltage pulses of equal magnitude and opposite signs (c) Two sharp voltage pulses of the same magnitude and sign (d) No voltage pulse would be generated as both electrons and ions will neutralise the charge collected by the capacitor

          C9 Consider a charge particle detection chamber as shown in the figure below. The
chamber is made of a set of parallel plates separated by 20 mm distance and connected
to the external resistance (R = 100 $\Omega$) as shown in the figure along with the high voltage
power supply of 1 kV.
$\uparrow$
4 mm
20 mm
R = 1000
$V_R$
$V_o$=1 kV
The chamber is filled with Argon (Ar) gas (ionization energy 16 eV). If a charged
particle passes through the chamber and loses sufficient energy, it ionizes the Ar atoms
and generates a small voltage pulse across the resistance R.
In an experiment, an alpha particle of energy 5.5 MeV enters the chamber at a distance
of 4 mm from the bottom plate, as shown, generating ion-electron pairs. If the effective
capacitance of the chamber is 100 pF, the measured voltage pulse shape would be best
described as:
(a) A sharp voltage pulse followed by a very weak broad pulse
(b) Two sharp voltage pulses of equal magnitude and opposite signs
(c) Two sharp voltage pulses of the same magnitude and sign
(d) No voltage pulse would be generated as both electrons and ions will neutralise
the charge collected by the capacitor

C9 Consider a charge particle detection chamber as shown in the figure below. The
chamber is made of a set of parallel plates separated by 20 mm distance and connected
to the external resistance (R = 100 Ω) as shown in the figure along with the high voltage
power supply of 1 kV.
↑
4 mm
20 mm
R = 1000
VR
Vo=1 kV
The chamber is filled with Argon (Ar) gas (ionization energy 16 eV). If a charged
particle passes through the chamber and loses sufficient energy, it ionizes the Ar atoms
and generates a small voltage pulse across the resistance R.
In an experiment, an alpha particle of energy 5.5 MeV enters the chamber at a distance
of 4 mm from the bottom plate, as shown, generating ion-electron pairs. If the effective
capacitance of the chamber is 100 pF, the measured voltage pulse shape would be best
described as:
(a) A sharp voltage pulse followed by a very weak broad pulse
(b) Two sharp voltage pulses of equal magnitude and opposite signs
(c) Two sharp voltage pulses of the same magnitude and sign
(d) No voltage pulse would be generated as both electrons and ions will neutralise
the charge collected by the capacitor

Added by Jessica V.

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