AQA A LEVEL 2021 PHYSICS COMPLETE PAPER
3 Latest Edition Question and Answer |
Complete Study Pack | Grade A+
• What did cathode rays cause in discharge tubes? -✓✓ dark space near cathode
• What are cathode rays deflected by, in low pressure discharge tubes? (2) -✓✓
electric fields, magnetic fields
• What is a cathode ray? -✓✓ beam of electrons
• How do cold discharge tubes produce electrons? -✓✓ electric field between
cathode and anode
• When heated, conduction electrons in a metal gain energy and leave the
surface. What is this called? -✓✓ thermionic emission
• Which electrode do electrons accelerate towards in a cathode ray tube? -✓✓
anode
• What is a quality of cathode ray tubes? -✓✓ evacuated
• What process causes electrons to be fired from an electron gun? -✓✓
thermionic emission
, • What is the kinetic energy of an electron as it is accelerated between the
cathode and anode in a cathode ray tube? -✓✓ (1/2)mv^2 = eV
• How can you increase speed of electrons in a cathode ray tube? -✓✓ increase
p.d.
• How can you make an electron beam more intense in a cathode ray tube? -✓✓
increase current
• Which has the larger specific charge? [hydrogen ion/electron] -✓✓ electron
• How did J.J. Thomson measure the specific charge of electrons? -✓✓ measured
deflection in cathode ray tube using electric and magnetic fields
• What equipment ensures electrons move in a straight line by producing a
magnetic field perpendicular to an electric field? -✓✓ Helmholtz coils
• What is the electric field strength between parallel plates? -✓✓ E = V/d
• What is the force on electrons due to an electric field? -✓✓ F = eE = eV/d
• What is the force on electrons due to a magnetic field? -✓✓ F = Bev
• When electric and magnetic fields balance and an electron beam is not
deflected, how is this expressed? -✓✓ eV/d = Bev
3 Latest Edition Question and Answer |
Complete Study Pack | Grade A+
• What did cathode rays cause in discharge tubes? -✓✓ dark space near cathode
• What are cathode rays deflected by, in low pressure discharge tubes? (2) -✓✓
electric fields, magnetic fields
• What is a cathode ray? -✓✓ beam of electrons
• How do cold discharge tubes produce electrons? -✓✓ electric field between
cathode and anode
• When heated, conduction electrons in a metal gain energy and leave the
surface. What is this called? -✓✓ thermionic emission
• Which electrode do electrons accelerate towards in a cathode ray tube? -✓✓
anode
• What is a quality of cathode ray tubes? -✓✓ evacuated
• What process causes electrons to be fired from an electron gun? -✓✓
thermionic emission
, • What is the kinetic energy of an electron as it is accelerated between the
cathode and anode in a cathode ray tube? -✓✓ (1/2)mv^2 = eV
• How can you increase speed of electrons in a cathode ray tube? -✓✓ increase
p.d.
• How can you make an electron beam more intense in a cathode ray tube? -✓✓
increase current
• Which has the larger specific charge? [hydrogen ion/electron] -✓✓ electron
• How did J.J. Thomson measure the specific charge of electrons? -✓✓ measured
deflection in cathode ray tube using electric and magnetic fields
• What equipment ensures electrons move in a straight line by producing a
magnetic field perpendicular to an electric field? -✓✓ Helmholtz coils
• What is the electric field strength between parallel plates? -✓✓ E = V/d
• What is the force on electrons due to an electric field? -✓✓ F = eE = eV/d
• What is the force on electrons due to a magnetic field? -✓✓ F = Bev
• When electric and magnetic fields balance and an electron beam is not
deflected, how is this expressed? -✓✓ eV/d = Bev
