Miscellaneous

Question 1

peak frequency

Answer 1

frequency hot objects emit the most of

brightness and peak frequency increases with temperature

Question 2

absorption spectra

Answer 2

electrons exposed to high temperatures move to higher energy levels when absorbing radiation
photons on continues spectrum pass through gas, electrons absorb specific frequencies of light, leaving gaps in the spectrum (unique to each substance)

Question 3

emission spectra

Answer 3

electrons that move to high energy levels move to lower energy levels to become more stable
by emitting radiation
making bright lines in spectrum

Question 4

how elements in stars can be indeitifed

Answer 4

stars emir continuous spectrum of radiation that pass through gases in its atmosphere
emission and absorption lines present in spectrum

Question 5

Doppler effect

Answer 5

change in frequency and wavelength when source moved relative to an observer

Question 6

red shift

Answer 6

frequency of light slower and wavelength longer
when light source is moving away observer
the further away and faster the galaxies are moving, the greater the red shift

Question 7

blue shift

Answer 7

opposite of red shift

Question 8

proof of universe expanding with Doppler effect

Answer 8

almost all light from other galaxies are red-shifted
galaxies further from us more red shifted than closer ones
universe is expanding and accelerating in its expansion

Question 9

car designs and safety

Answer 9

crumple zones (absorbs energy in collision, increases time for velocity to drop to 0)
airbags (slow passengers down, protect from hitting hard surfaces)
seatbelts (stretch to increase time for impact to occur)
side impact bars (metal tubes in car door panels, increase impact time, directs KE away from passengers)
anti-locking braking system (ABS, prevents wheel from locking to avoid skidding)