Refraction
Compare reflection to refraction
reflection - light bouncing of surface
refraction - light bending as it passes through different mediums
A pendulum is travelling from its lowest point to its highest point.
Describe the relationship between EK and GPH through this journey.
Describe frequency
the number of wave cycles completed in a second
Identify the three types of radiation we discuss this term.
Alpha
Beta
Gamma
Uranium-238 undergoes alpha decay. Uranium has an atomic number of 92.
Determine the mass number and atomic number of the new isotope.
mass number = 234
atomic number = 90
product of initial light angle and refractive index of one material
is equal to
the product of the refracted light angle and the refractive index of the second material
velocity = 86 m/s
Calculate EK
EK = 0.5 x 0.247 x 86^2
= 913.406 J
Compare transverse waves with longitudinal waves.
transverse wave - particle vibration perpendicular to the direction of energy; travel through medium or vacuum
longitudinal wave - particle vibration parallel to energy flow; travel through medium only
Identify the possible products of beta decay.
B-
Element with +1 atomic number, electron & antinutrino
B+
Element with -1 atomic number, positron & nutrino
A 5kg sample has a half-life of 33 days.
Calculate the remaining mass after 1 year.
mass = 0.0023 kg
A ray of light is travelling from diamond (n = 2.42) into opal (n = 1.45).
Angle of refraction = 24 deg
Calculate angle of incidence
2.42 x sinθ = 1.45 x sin(24)
θ = 14.11 deg
Determine its final velocity before landing.
v = 18.263 m/s
time for wave to complete one cycle = 11ms
wave velocity = 209 m/s
calculate wavelength
209 x 0.011 = 2.299 m
You are underwater looking up at 45deg to normal. You see a drone hovering in the air.
Where will the drone actually be.
Greater than 45deg to normal (bending away from normal).
Define the term 'half-life'
the time it takes for half of a given amount of a substance to break down