(a) The wavelength of a Balmer series line (from n = 3) for by found to be 656.5 nm. What percentage difference is found between the
and the wavelength predicted by ; = R
( 7 )
[R = 1.097 x 107m]
[GMarks)
(b) If a hydrogen atom has its electron in the n = 4 state, how much energy
in eV is needed to ionize it?
= 3 x 108m/s, h = 6.6 x 10-341/s, 1ev = 1.602 x 10-9/] [6 Marks]

A1000-kg weather rocket is launched straight up. the rocket motor provides a constant acceleration for 16-s, then the motor stops. the rocket altitude 20-s after launch is 510-m. you can ignore any effects of air resistance. a. what was the rocket’s acceleration during the first 16-s? b. what is the rocket’s speed as it passes through a cloud 5100-m above the ground?

The x-coordinate of a particle in curvilinear motion is given by x = 3.1t3 - 4.9t where x is in feet and t is in seconds. the y-component of acceleration in feet per second squared is given by ay = 2.3t. if the particle has y-components y = 0 and vy = 5.0 ft/sec when t = 0, find the magnitudes of the velocity v and acceleration a when t = 1.8 sec. sketch the path for the first 1.8 seconds of motion, and show the velocity and acceleration vectors for t = 1.8 sec. answers: v = ft/sec a = ft/sec2

How can you increase the strength of an electromagnet?