Waves
What are Seismic P-Waves classified as?
Longitudinal Waves
What does the arrow in a magnetic field show?
Direction of magnetic fields
What is the speed of light in km?
3x10^5km/s
What is the least ionizing radiation amongst the three types of radiation?
Gamma
What is the focal point
The point at which all light rays coming from a single direction and passing through a lens or striking a mirror converges
What is the refractive index for a diamond?
2.4 or 2.42
What is the difference between d.c and a.c
d.c only flows in one direction, whilst a.c flows both directions
What is the tilt of the Earth
23.5 degrees
What stops alpha rays from passing through
Fun fact: alpha rays cannot penetrate our skin
Draw a ray diagram at U>2f
inverted, real, diminished diagram
Gamma, X-ray, UV, Visible light, Infrared, Micro, Radio
240V
What is the diameter of the Milky Way
100 000 light years
Write the alpha decay equation of protactinium-234
(231,91) Pa --> (227,89) Ac + 4,2He or (0,-1)e
What lens is used for short-sightedness
concave lens
A fishing boat uses sonar to locate a shoal of fish. When the sonar hits the shoal, the sound wave is detected back and detected by the detector under the ship. The pulse of sound waves is received at 0.79s after being emitted. What is the distance between the boat from the shoal of fish. Give your answer in km
0.5925km or 0.59km
(shown on the diagram)
Left: N Right: S
What are the three factors that forms an accretion disk
Mass, gravity, dust cloud
What is the half life of the source in SI units
18000 seconds
Draw the ray diagram for U<f and write the characteristics of the image formed
upright, virtual, magnified
Calculate angle X and Y. Diamond refractive index is 2.42. Give your answers in 2 significant figures
X= 18 degrees
Y= 72 degrees
What is the magnetic pole at P when the South Pole of the magnet is brought towards and away from the solenoid
S pole brought towards P: S
S pole moved away from P: N
Describe the formation of inner planets
- The accretion model of our solar system says that there are dust leftover after the Sun is formed
-The dust made a disc that orbits around the Sun due to gravity, then these dust clump together due to gravitational attraction between particles
- Inner planets are rocky because of high temperature from the Sun
An isotope of Substance X has a half-life of 1.17 minutes.
Calculate the amount of time it takes for a sample to decay from a mass of 100 mg to 1.5625 mg. Write your answer in seconds and in 3 significant figures
421 seconds
What image characteristics does a photocopy machine produce? Draw the diagram for it
U=2f diagram, real, inverted, same size