(2 marks) QUESTION 4
a) Fill in the blank with the correct answer.
is a process where protons are ejected from a metal surface when light is
incident on that surface.
(1 mark)
b) The activity of a radioisotope is found to decrease 40% of its original value in
2.59 x 106 s.
Calculate;
i) The decay constant of the radioisotope.
(3 marks)
ii) The half-life of the radioisotope.
(2 marks)
END OF QUESTION PAPFR

In which of the following would the particles move most rapidly? a. ice at -20 °c b. water at 20 °c c. steam at 110 °c d. boiling water e. ice at 0 °c

At a certain instant after jumping from the airplane a, a skydiver b is in the position shown and has reached a terminal (constant) speed vb = 52 m/s. the airplane has the same constant speed va = 52 m/s, and after a period of level flight is just beginning to follow the circular path shown of radius ρa = 2330 m. (a) determine the velocity and acceleration of the airplane relative to the skydiver. (b) determine the time rate of change of the speed vr of the airplane and the radius of curvature ρr of its path, both as observed by the nonrotating skydiver.

Auniform crate c with mass mc is being transported to the left by a forklift with a constant speed v1. what is the magnitude of the angular momentum of the crate about point a, that is, the point of contact between the front tire of the forklift and the ground