A train travels the distance from Blaenau Ffestiniog to Wrexham in Wales in 2 hours and 15 minutes. If these two places are 135 km apart, what is the average speed of the train in kilometres per hour?

The difference between a red shift and a blue shift has to do with wavelength frequency. t or f

Photoelectrons with a maximum speed of 6.50 x 107 m/s are ejected from a surface in the presence of light with a frequency of 6.75 x 1014hz. if the mass of an electron is 9.10 x 10-31 kg, calculate in joules the maximum kinetic energy of a single electron. 3.84 x 10-15 j 1.92 x 10-15 j 5.92 x 10-23 j 3.07 x 10-16 j

Which of the following is an example of motion in two dimensions?