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A RSNR120 > Biophysics > Flashcards

Biophysics Flashcards

1
Q

Scalar quantity

A

– a physical quantity described by a single number eg. time, temperature, mass, density, electric charge.

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2
Q

Vector quantity

A

Vector quantity– a physical quantity described by both magnitude and direction eg. the motion of an aeroplane, displacement, position, velocity, acceleration, force.

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3
Q

Is distance a vector or a scalar

A

Scalar

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4
Q

What is displacement and is it a vector or a scalar

A

Displacement represents a change in position (between start and finish points in a defined interval). It is a VECTOR

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5
Q

what is the unit of measure for displacement?

A

metres

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6
Q

Is a average velocity a vector or a scalar?

A

Vector

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7
Q

Is average speed a vector or a scalar?

A

Scalar

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8
Q

What is Velocity

A

Velocity is the rate at which displacement changes

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9
Q

What is Acceleration

A

Acceleration is the rate at which velocity

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10
Q

Uniform acceleration

A

If the acceleration is constant then velocitytime graph is a straight line. (The velocity changes consistently with time).

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11
Q

What dose GPS stand for??

A

= Global Positioning System, is an

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12
Q

Sources of error in GNSS

A

Satellite clocks and orbit errors – ie the satelites aren’t exactly where we think they are and their clocks are out of sync with the receivers. • Ionospheric and tropospheric delays – the signal travels slower than we think • Receiver’s environment – (multipath- signal bounces off objects on way to receiver hence path isn’t a straight line • Satellite constellation – Even when you get the range right, the small angles between satellites increases the error of the position fix.

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13
Q

What are Conductors and an example of it?

A

Conductors allow flow of charge (electrons) easily (eg metals)

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14
Q

What are Insulators and an example of it?

A

Insulators do not allow flow of charge • (eg glass, wood)

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15
Q

Ohm’s Law

A

• Predicts the relationship between voltage, current and resistance across a segment

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16
Q

What is peak to peak

what is ampiltude

what is a peoird

A
17
Q

What are Wavelength and Amplitude

A
18
Q

What are Transverse wave

A

Transverse wave – particles oscillate at right angles to direction of waves

19
Q

What are Longitudinal wave? and an exmaple

A

•Longitudinal wave - particles oscillate along the direction of the waves

-

20
Q

Scientific notation is used to render a large or small number into a form that is readily manageable in calculations. The mass of a particular boulder is 148,321 kg. Written in scientific notation, this mass is (a) 148.321 kg

(b) 1.48 kg
(c) 1.48 x 10-5 kg
(d) 1.48 x 105 kg

A

(d) 1.48 x 105 kg

21
Q

Which of the following is a vector ?

(a) mass
(b) time
(c) velocity
(d) speed

A

(c) velocity

22
Q

A person fires a rifle at a nearby target but completely misses. At the same time a person standing beside the shooter, drops a similar projectile at the same instant the rifle is fired, and from the same height at which the rifle is positioned. The fired projectile should hit the ground in the distance

(a) at the same time as the projectile dropped by the nearby observer
(b) in half the time it takes for the dropped projectile to hit the ground
(c) in twice the time it takes for the dropped projectile to hit the ground
(d) none of the above.

A

(a) at the same time as the projectile dropped by the nearby observer

23
Q
A
24
Q

Electric current is

(a) the flow of electric charge
(b) the presence of static (stationary) electric charge
(c) the absence of electric charge
(d) the resistance of an object to the flow of electric charge.

A

(a) the flow of electric charge

25
Q

Select the correct set of information

(a) Electric current is measured in Volts, Potential Difference in Amperes and Resistance in Ohms
(b) Electric current measured in Amperes, Potential Difference in Volts and Resistance in Ohms
(c) Electric current measured in Amperes, Potential Difference in Ohms and Resistance in Volts
(d) Electric current measured in Ohms, Potential Difference in Volts and Resistance in Amperes

A

(b) Electric current measured in Amperes, Potential Difference in Volts and Resistance in Ohms

26
Q

Select the correct set of information

(a) An ammeter is connected in parallel with the conductor you are trying to test.
(b) A voltmeter is connected in series with the component you are trying to test the potential difference across.
(c) A voltmeter has a large internal resistance to limit the current flowing out from the circuit you are trying to test into the meter itself.
(d) In order to test the electrical resistance of a component, it is ok to leave the component connected, in-situ, in the circuit.

A

(c) A voltmeter has a large internal resistance to limit the current flowing out from the circuit you are trying to test into the meter itself.

27
Q

Consider three sources of electrical power

i. Battery,
ii. Solar, and
iii. Mains power.

Which of the following combinations is correct

(a) i and ii are both dc
(b) i and iii are both ac
(c) ii and iii are both ac
(d) i and ii are both ac.

A

(a) i and ii are both dc

28
Q

Which examples below DOES NOT involve a transverse wave ?

(a) Surfing
(b) the sound of a distant voice
(c) the heat from a nearby fire
(d) the light from a spotlight

A

(b) the sound of a distant voice

29
Q

Which of the following combination of characteristics is TRUE in relation to sound waves

(a) Sound waves are longitudinal waves and can travel through a vacuum
(b) The frequency of sound relates to its pitch and amplitude relates to its ‘loudness‘
(c) The speed of sound in air is 3 x 10 8 m s-1 and sound waves can be easily overtaken by fast-moving aircraft
(d) Sound waves travel slower in water than air and their speed does not change with changing temperature

A

(b) The frequency of sound relates to its pitch and amplitude relates to its ‘loudness‘

30
Q

Which of the following statements is FALSE

(a) Light waves travel in a straight line but can bend when travelling through a change in refractive index
(b) The refractive index of a medium is determined by comparing the speed of light in it with that in a vacuum
(c) Light travels faster in an optically dense medium (for example glass) compared to a vacuum
(d) The index of refraction of materials is wavelengthdependent and results in the splitting of light into its component wavelengths as when it passes through a glass prism

A

(c) Light travels faster in an optically dense medium (for example glass) compared to a vacuum

31
Q

Light of a particular colour has a specific wavelength, and frequency. For light of a frequency 5.46 x 1014 Hz, which option below is the correct one.

(a) Wavelength 480 x 10-9 m, colour blue
(b) Wavelength 550 x 10-9 m, colour green
(c) Wavelength 550 x 10-9 m, colour orange
(d) Wavelength 480 x 10-9 m, colour green

A

(b) Wavelength 550 x 10-9 m, colour green

32
Q

Light of wavelength 650 nm is coloured

(a) Violet
(b) Blue
(c) Green
(d) red

A

(d) red

A RSNR120 (7 decks)

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