Physics P1

Question 1

what do you know about the speed of electromagnetic waves?

Answer 1

It is constant and equal to the speed of light

Question 2

electromagnetic wave

Answer 2

a wave that propagates when an electric field oscillating in one plane produces a magnetic field oscillating in a plane at right angles to it

Question 3

why are electromagnetic waves classified as transverse waves?

Answer 3

The changing electric and magnetic fields oscillate at right angles to the diretion the wave is travelling

Question 4

EM spectrum (increasing frequency)

Answer 4

radio waves, microwaves, infrared rays, visible light, UV rays, X-rays, gamma rays

Question 5

ionising radiation

Answer 5

electromagnetic waves that have enough energy to break chemical bonds and form ions

Question 6

one photon

Answer 6

A quantum (energy packet) of light

Question 7

wave-particle duality of EM radiation

Answer 7

light has wave-like and particle-like properties

Question 8

how are elecromagnetic waves formed?

Answer 8

Oscilating charges speed up and slow down, causing a changing electric field which produces a changing magnetic field. The process is self propagating

Question 9

principle of charge quantization

Answer 9

all chaarges consist of an integer multiple of the charge of single electron (Q=nqe)

Question 10

principle of conservation of charge

Answer 10

the charge of an isolated system remains constant during any physical process

Question 11

distance vs displacement

Answer 11

the total path length travelled vs the overall change in position of an object

Question 12

pulse

Answer 12

single disturbance that moves through a medium

Question 13

wave

Answer 13

a regular succession of pulses

Question 14

transverse wave

Answer 14

particles oscillate at right angles to the direction of motion of the wave

Question 15

longitudinal wave

Answer 15

particles oscillate parallel to the direction of motion of the wave

Question 16

principle of superposition

Answer 16

when two or more pulses meet, the resultant is the algebraic sum of their amplitudes

Question 17

constructive interference

Answer 17

the crest of one pulse overlaps ith the crest of another increasing amplitude

Question 18

destructive interference

Answer 18

crest of one pulse overlaps with the trough of another decreasing amplitude

Question 19

wavelength

Answer 19

distance between two successive points on a wave that are in phase

Question 20

amplitude

Answer 20

position of maximum displacement from equilibrium position

Question 21

frequency

Answer 21

number of waves passing a point per second

Question 22

period

Answer 22

time taken for one wave to pass a point

Question 23

gravitational potential energy

Answer 23

the energy that an object has because of its position relative to a reference point

Question 24

law of conservation of energy

Answer 24

the total energy of an isolated sysem remains constant

Question 25

ohm’s law

Answer 25

the potential difference across a conductor is directly proportional to the current flowing through the conductor at constant temperature