Jady

Three emission lines involving three energy levels in an atom occur at wavelengths x, 1.5x, and 3.0x nanometers. Which wavelength corresponds to the transition from the highest to the lowest of the three energy levels? Please help me, thank you very much...

Factorise X^2y + x^2 -4xy- 16

A truck pulls a trailer at 75km/h and exerts a uniform pulling force of 800N on the trailer .calculate 1. The work done by the trailer in 30min. 2.the power required to pull the trailer.

Factorise 2y^2 + y - 3

Factorise 20x^2 -x -1

Factorise (X -2y )^2 -16/49

is it the wavelength? I have no idea.