Physics random stuff Flashcards

1
Q

is the mains a.c. or d.c.

A

a.c.

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2
Q

are batteries or cells a.c. or d.c.

A

d.c.

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3
Q

which way does current flow

A

from positive to negative

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4
Q

which way do electrons flow

A

from negative to positive

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5
Q

are the oscillations of transverse waves parallel or perpendicular to direction of wave

A

perpendicular

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6
Q

are the oscillations of longitudinal waves parallel or perpendicular to direction of wave

A

parallel

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7
Q

what type of wave is sound

A

longitudinal

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8
Q

what type of wave is light

A

transverse

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9
Q

simple definition of doppler effect

A

when the wavefronts are bunched or spaced apart

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10
Q

what changes when a wave is refracted

A

the wavelength and velocity

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11
Q

what type of waves are the electromagnetic waves

A

transverse (they are forms of light)

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12
Q

radiowaves uses and wavelength

A
  • radio and television communication
  • have a long wavelength
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13
Q

microwaves uses and wavelength

A
  • satellite transmissions and cooking
  • shorter wavelength and larger frequency
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14
Q

infrared radiation uses and hazards

A
  • heaters and night vision
  • skin burns
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15
Q

visible light uses

A

fibre optics and photography

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16
Q

ultraviolet light uses and hazards

A
  • fluorescent lamps
  • increases risk of skin cancer and blindness
17
Q

x rays uses, wavelength and hazards

A
  • security and medical imaging
  • short wavelength and high frequency
  • form of ionising radiation which could cause cell mutations and cancer
18
Q

gamma rays uses and hazards

A
  • medical equipment and sterilizing food
  • ionising radiation - mutations - cancer
19
Q

what is conduction

A

thermal energy transferred by the particles vibrating and hitting other particles

20
Q

what is convection

A

molecules in a fluid flowing from a high to low thermal energy area

21
Q

boyles law

A

p1 x V1 = p2 x V2 and p1/T1 = p2/T2

22
Q

does a step-up transformer have more or less turns on the secondary than the primary

A

more - meaning the secondary has higher voltage

23
Q

does a step-down transformer have more or less turns on the secondary than the primary

A

less

24
Q

relative mass of an electron

A

1/1850

25
Q

what is a beta particle

A

an electron

25
Q

what is a beta particle

A

an electron