Physics random stuff

Question 1

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

Answer 1

a.c.

Question 2

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

Answer 2

d.c.

Question 3

which way does current flow

Answer 3

from positive to negative

Question 4

which way do electrons flow

Answer 4

from negative to positive

Question 5

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

Answer 5

perpendicular

Question 6

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

Answer 6

parallel

Question 7

what type of wave is sound

Answer 7

longitudinal

Question 8

what type of wave is light

Answer 8

transverse

Question 9

simple definition of doppler effect

Answer 9

when the wavefronts are bunched or spaced apart

Question 10

what changes when a wave is refracted

Answer 10

the wavelength and velocity

Question 11

what type of waves are the electromagnetic waves

Answer 11

transverse (they are forms of light)

Question 12

radiowaves uses and wavelength

Answer 12

• radio and television communication
• have a long wavelength

Question 13

microwaves uses and wavelength

Answer 13

• satellite transmissions and cooking
• shorter wavelength and larger frequency

Question 14

infrared radiation uses and hazards

Answer 14

• heaters and night vision
• skin burns

Question 15

visible light uses

Answer 15

fibre optics and photography

Question 16

ultraviolet light uses and hazards

Answer 16

• fluorescent lamps
• increases risk of skin cancer and blindness

Question 17

x rays uses, wavelength and hazards

Answer 17

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

Question 18

gamma rays uses and hazards

Answer 18

• medical equipment and sterilizing food
• ionising radiation - mutations - cancer

Question 19

what is conduction

Answer 19

thermal energy transferred by the particles vibrating and hitting other particles

Question 20

what is convection

Answer 20

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

Question 21

boyles law

Answer 21

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

Question 22

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

Answer 22

more - meaning the secondary has higher voltage

Question 23

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

Answer 23

less

Question 24

relative mass of an electron

Answer 24

1/1850

Question 25

what is a beta particle

Answer 25

an electron

Question 25

what is a beta particle

Answer 25

an electron