Alevel physics

Question 1

mechanical waves

Answer 1

only possible in a medium

Question 2

mechanical waves are created when ?

Answer 2

particles oscillate in a delayed reaction to each other

Question 3

mechanical waves examples

Answer 3

sound, water ,ultrasound waves

Question 4

sound wave L or T wave

Answer 4

Longitudinal

Question 5

seismic wave

Answer 5

either T or L

Question 6

Water wave

Answer 6

transverse and longitudinal

Question 7

What happens in a mechanical transverse wave

Answer 7

the particles in the medium oscillate around their equilibrium positions in a direction perpendicular to the direction of wave travel

Question 8

What would the ideal sound waves particles in air do

Answer 8

oscillate around a mean position moving parallel to the direction of wave travel

Question 9

longitudinal wave

Answer 9

energy propagates parallel to the direction of particle oscillation

Question 10

baryon number of an up quark

Answer 10

+1/3

Question 11

baryon no. of down quark

Answer 11

+1/3

Question 12

baryon no. of strange quark

Answer 12

+1/3

Question 13

charge of up quark

Answer 13

+2/3

Question 14

charge of down quark

Answer 14

+1/3

Question 15

charge of strange quark

Answer 15

-1/3

Question 16

strangeness of up quark , down quark , strange quark

Answer 16

respectively 0, 0, -1

Question 17

to calculate specific charge of a nucleus

Answer 17

• total charge is calculated from the number of protons
• then do the mass number - the atomic number to get the number of neutrons
  -do the mass of neutrons times this and add the number of protons * the proton mass
  do total charge over total mass

Question 18

units for specific charge

Answer 18

ckg^-1

Question 19

specific charge for an atom

Answer 19

is 0 because atoms are neutral ( same protons and neutrons in the nucleus )

Question 20

specific charge of an ion

Answer 20

• for total mass do mass p + mass n + mass e
• for total charge do the protons and electrons
  q/m