Aray of light passes from air into
water with an angle of incidence of
30
o. which of the following quantities
does not change as the light enters the
water.
a) wavelength
b) frequency
c) speed of propagation
d) direction of propagation.

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

The mantle is made up of which structural zones?

Heterogeneous mixture with larger particles that never settle is