A student wants to heat a piece of iron so that its temperature rises by 20 degrees C. What information does she need about the iron to plan the
experiment?
Select one:
Surface area
Conductivity
Temperature.
Mass.

Hydrogen atoms are excited by a laser to the =4n=4 state and then allowed to emit. what is the maximum number of distinct emission spectral lines (lines of different wavelengths) that can be observed from this system? 8 6 2 7 4 5 1 3 calculate the wavelength of the 4⟶14⟶1 transition. =λ=

If anyone who can me with this hw? i would really appreciate it

Scientific models are based on current knowledge, which can limit their effectiveness when new discoveries are made.