Teacher:You are given a short paragraph, a question and two choices to answer from. Choose the correct answer based on the paragraph and write the answer(not the key).
Teacher: Now, understand the problem? Solve this instance: Paragraph: Electromagnetic waves with shorter wavelengths have higher frequencies and more energy.
 Question: If Jim lengthens the wavelength of the electromagnetic waves his machine is producing, what happens to the energy output? 
 Choices: A)it increases 
B)it decreases
Student:
it decreases