physics exam 1 Flashcards

Question

Transition between energy levels

Answer 1

A

measurable observables,
when measured, has magnitude and reference units.

Answer 2

A

fundamental quantities, cant be expressed by other base quantities

Answer 3

A

can be described by base quantities, product of powers

Answer 4

A

symmetries.

Answer 5

A

operations on a system that will ultimately leave it unchanged

Answer 6

A

-when moving an origin (translation in space)-> momentum is conserved
-time, with the conserved quantity associated being energy
-rotation in space, conserved quantity is angular momentum

Answer 7

A

any time symmetry is observed, there must be a conserved quantity associated

Answer 8

A

projectile: KE is almost the same, the velocity vector is in the opposite direction

for the projectile: V1 F =(approx) V 1i

for the target: V2F =/ 0
because of recoil. recoil energy is equal to the energy lost by the projectile

Answer 9

A

V1f= 0
V2f = V1i

Answer 10

A

V1F=V1i
V2F= 2V1i

KE is almost the same
projectile keeps moving
projectile always loses small amount of E to the target

Answer 11

A

a set of axes, that you establish, where you measure time.

used to define the space around in Cartesian (x, y, z )

Answer 12

A

has constant velocity, non accelerated
and no external forces

Answer 13

A

time dilation and length contraction

Answer 14

A

how the observer measures time of an object

the time interval in the moving frame is longer than in the rest frame

the observer will perceive the moving reference as being slower.

Answer 15

A

observer measures length, but the moving object experiences length contraction because of how fast its traveling

at faster speeds, objects and distances appear shorter- meaning only the observer of the moving object can calculate proper length, through their rest frame.