Correct answer
B. 4
Explanation
4 is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.
When X-rays are passed through successive aluminum sheets what happens to their thickness ?
Resistance of a wire on increasing its temperature will_________________?
The__________branch of Physics deals with nuclear particles such as neutrons, protons and nuclear?
The diameter of a lens is called________________?
When we excite some atoms by heat collision or electrical discharge they will________________?
Which of the following waves have smallest velocity in vacuum?