PC1131 Flashcards
main things in PC1131
What is the Gravitational Field Strength on Earth?
9.81N/kg
Weight formula
W=mg
Density formula
D=m/v
Frequency formula
f=1/T
1g/cm^3=?kg/m^3
1000
Speed of Wave formula
V=fλ / V=λ/T
Speed of Sound
v=d/t (or usually 343/300 m/s)
Speed of Sound (from echo)
V=2d/t
Reflection Law
angle i = angle r
Snell’s Law
n1 sinθ1 = n2 sinθ2
Refractive index
n=c/v / n=real depth/apparent depth
EM spectrum
from longest wavelength
Radio, Microwaves, Infrared, Visible, Ultraviolet, X-Ray, Gamma
Transverse wave is…?
a wave in which the displacement of the particles in the wave is perpendicular to the direction in which the wave travels
Longitudinal wave is…?
a wave in which the displacement of particles in the wave in parallel to the direction in which the wave travels
Crests are…?
the highest points of a wave
Troughs are…?
the lowest points of a wave
Amplitude is…?
the maximum displacement from the rest position.
Period is…?
the amt of time taken for one wavelength
Regular reflection occurs…?
at smooth surfaces
Diffused reflection occurs…?
at rough surfaces
A mirror image is…?
upright, same size as object, equal distance as the actual object from mirror, laterly inverted and virtual
Basic colour are…?
What are the secondary colours…?
RGB
R+B= Magenta
R+G=Yellow
B+G= Cyan
What colour would a red rose look under…
(i) yellow light
(ii) cyan light
Red. Red would be reflected while green in absorbed
Black. Cyan is green and blue light, thus the rose absorbs both colours of light
