Why is lightning visible before thunder is heard?
A
Sound cannot reflect off surfaces as easily as light.

B
Sound travels slower than light can travel.

C
Sound is not processed by the brain as fast as light.

D
Sound needs a medium to travel through.

The force acting on a beam was measured under the same operating conditions and a sample of 5 data points was collected. this process was repeated by 3 observers. the pooled standard deviations of these 3 data sets was 1.21. determine the true mean force using all pooled data (with a 95% probability). the result should look like this: true mean = mean +/- margin of error

Consider an insulating crystal, made up of layers of atoms. what form would you expect the temperature dependence of the phonon heat capacity to approach at extremely low temperatures if the interlayer coupling is i)very strong (rigid coupling), and ii) very weak. explain.

How to tell if a molecule is polar or nonpolar with electronegativity