An atom of an element can change into an atom of another element if it is A
extremely stable and has a long life.
B
radioactive and its nucleus emits or traps particles.
С
an isotope and it contains more electrons than neutrons.
D
an ion and its atomic number is larger than its mass number.

What is the energy of a photon of ultraviolet radiation with a frequency of 4.4 × 1015 hz? planck’s constant is 6.63 × 10–34

What is the role of the water cycle in maintaining freshwater levels in lake and rivers?

Dc versus ac problem. suppose your dc power supply is set to 15 v and the vertical setting on the oscilloscope is at 5 v/div. how many divisions will the trace deflect if you connect the output of the power supply to the scope with the a input switch set on dc? how many divisions if the switch is on ac?