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GAMSAT STUDY S3 > Physics > Flashcards

Physics Flashcards

1
Q

what the equation for Pressure?

A

P = F/A

pressure (Pa) = force (N) /area (m^2)

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2
Q

What is the equation for mass density?

A

pm = m/V

mass density (kg/m^3) = mass (kg) / volume (m^3)

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3
Q

What is the equation for weight density?

A

pw = w/V

weight density (N/m^3) = weight (N) / volume (m^3)

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4
Q

How is weight density obtained from mass density?

A

by multiplying mass density by the acceleration of gravity (9.8m/s^2)

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5
Q

in what unit is pressure measured in for GASES?

A

atmospheres (atm = 1 at sea level, 0 degrees celsius)

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6
Q

waves have three measurable properties which are…

A

wavelength, amplitude, frequency

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7
Q

describe the relationship between wavelength and frequency

A

they are inversely proportional

  • longer wavelength = lower frequency
  • shorter wavelength = higher frequency
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8
Q

Wavelength can be measured in …

A

Angstroms (A) or nanometers (nm)

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9
Q

What is reflection, refraction and absorption?

A
  • reflection occurs when light (travelling as particles) hit a smooth or bumpy, bright surface, causing it to project back towards its origin either in a straight line or in multiple directions.
  • refraction is when light (travelling as particles) hits a transparent surface, causing it to travel past the surface to the other side.
  • absorption is when light is absorbed into the medium or surface
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10
Q

what happens to light when it travels through a surface that is a different medium to air?

A

the wavelength of the light will change, causing it to change in direction, known as angle of refraction.

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11
Q

how is colour perceived?

A
  • by the way different objects reflect, refract or absorb light.
  • different objects reflect only certain wavelengths of light and absorb the rest.
  • the light that is reflected is the colour that is perceived.
  • white light is a reflection of all the wavelengths.
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12
Q

What are the main colours of the light spectrum?

A

red, yellow, blue

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13
Q

How is colour and light detected by the eyes?

A

by cone cells and rod cells in the retina

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14
Q

electricity exists because..

A

all particles which make up the universe are charged (neg/pos)

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15
Q

an electric current is…

it is measured in…

A
  • the movement or flow of charged particles from one place to another
  • volts or amperes
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16
Q

electric charge is…

it is measured in…

A
  • the positive and negative forces which make up atoms

- coloumbs

17
Q

What is coloumb’s law?

A

a measure of the electrical force between two charged particles, which is inversely proportional to the distance between them.

18
Q

What is an electric field?

A

a field of electrical charge surrounding a particle, which is equivalent to its net charge.

  • E = Fc/q
  • electric field = couloumb force / net charge or particle
19
Q

What is an Ampere?

A
  • the number of coloumbs passing a certain point per second
  • I = C/s
  • electric flow = coloumb/second
20
Q

What is a Volt?

A
  • the unit measuring the amount of pressure pushing an electric flow through a circuit.
21
Q

What are the relationships between conduction of an electric current and diameter, length, voltage and resistance of a wire/circuit?

A

the conduction of a current is directly proportional to the diameter and voltage and inversely proportional to the length and resistance.

22
Q

What are the three equations for Ohm’s Law?

A
  • Voltage (V)
  • Resistance (R; measured in ohm’s)
  • Current (I; measured in amperes)
V = IR
R = V/I
I = V/R
23
Q

What are the four components of an electric circuit?

A
  • generator (battery)
  • conductor (wire)
  • resistor
  • load (electrons)
24
Q

What are the 4 components of sound waves? and how do they relate?

A
  • wavelength (lambda)
  • Frequency (f; Hz)
  • Amplitude
  • Speed (k)

Wavelength = k / f

25
Q

How does pressure in the medium in which sound waves travel, affect them?

A
  • higher pressure leads to lower frequency and lower speed of travelling through the medium
  • lower pressure leads to higher frequency and greater travelling speed.
26
Q

what is the mass density of water for one cubed meter?

A

1000kg/m^3

27
Q

what is the hearing range (frequency) for humans?

A

20 - 20,000 Hz

28
Q

What is the difference between light and sound waves?

A
  • light waves do not require a medium for travel, sound waves require a medium hence cannot travel through a vacuum.
  • there is no particle theory for sound waves

GAMSAT STUDY S3 (2 decks)

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