A photographer wishes to photograph a lightning bolt by setting a camera so that it is triggered by the sound of thunder. Is this a good idea or a poor idea?

When a wave source in air exceeds the speed of sound, the result is a

The isotope lithium-7 has a mass of 7.0160 atomic mass units, and the isotope lithium-6 has a mass of 6.0151 atomic mass units. Given the information that 92.58 percent of all lithium atoms found in nature are lithium-7 and 7.42 percent are lithium-6, calculate the atomic mass of lithium, Li (atomic number 3).

Light will not pass through a pair of Polaroids when their axes are

Given the following generic chemical reaction, which is the product? X → Y

For the following acid-base reaction, identify which salt is formed. HCl + NaOH ⇌ ???? + H 2O

Object and image for a plane mirror lie

Refraction occurs when light passing from one medium to another

What is the name of the compound with the formula CBr4?

Which should be larger, the potassium atom, K, or the potassium ion, K +?