Explain what is meant by forced vibrations (5)
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forced vibrations = periodic force applied (1) frequency determined by as
frequency of oscillator (1) phase difference is 180 degrees (pi rads) (1)
frequency of driver > frequency of oscillator (1) amplitude small at high
frequency and vice versa
newton's third law
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, every action has an equal and oppisite reaction
conditions for equilibrium
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resultant force is 0 (1) resultant torque is 0 (1)
Effect on diffraction pattern when wavelength decreases (3)
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Maxima closer together (1) angle decreases (1) smaller path difference (1)
newton's second law
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f=ma
Explain how excitation takes place in a fluorescent tube
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, Electrons flow through the tube to the applied PD causing a current to flow (1)
Electrons collide with mercury atoms in the tube (1)
This raises electrons in the mercury atom to a higher energy level (1)
define center of mass
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the point in the body through which the mass appears to act
Formation of a stationary wave
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Two waves superpose (1)
same wavelength and/or frequency (1)
Travelling with equal and opposite velocity (direction of movement) (1)
explain what is meant by spring constant (k)
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force divided by extention
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forced vibrations = periodic force applied (1) frequency determined by as
frequency of oscillator (1) phase difference is 180 degrees (pi rads) (1)
frequency of driver > frequency of oscillator (1) amplitude small at high
frequency and vice versa
newton's third law
Give this one a try later!
, every action has an equal and oppisite reaction
conditions for equilibrium
Give this one a try later!
resultant force is 0 (1) resultant torque is 0 (1)
Effect on diffraction pattern when wavelength decreases (3)
Give this one a try later!
Maxima closer together (1) angle decreases (1) smaller path difference (1)
newton's second law
Give this one a try later!
f=ma
Explain how excitation takes place in a fluorescent tube
Give this one a try later!
, Electrons flow through the tube to the applied PD causing a current to flow (1)
Electrons collide with mercury atoms in the tube (1)
This raises electrons in the mercury atom to a higher energy level (1)
define center of mass
Give this one a try later!
the point in the body through which the mass appears to act
Formation of a stationary wave
Give this one a try later!
Two waves superpose (1)
same wavelength and/or frequency (1)
Travelling with equal and opposite velocity (direction of movement) (1)
explain what is meant by spring constant (k)
Give this one a try later!
force divided by extention
