Which of the following is not an example of a transmutation? a. uranium-238 emits an alpha particle forms thorium-234 b. uranium-238 is bombarded with a neutron to produce uranium-239 c. potassium-38 emits a beta particle and forms argon-38 d. plutonium-239 is bombarded with two neutrons to produce americium-241 and a beta particle

The right option is (C).

The potassium-40 is the isotope of potassium which has the half-life of 1.251×109 years to reduce its half quantity. There are rare elements present on earth which follow the two type of beta decay. Potassium-40 is one of them which can decay as beta decay to convert into Ca-40 or electron capture decay to convert into the Ar-40. In this second decay, they also emit gamma rays. So, the right option is (C) which wrong regarding the transmutation.

the components of a vector are the parts of the vectors that are to each other.

b perpendicular