An x-ray tube contains a target consisting of atoms with z = 44. the high voltage in this tube is increased from zero. using the bohr model, find the value of the voltage at which the x-ray just appears in the x-ray spectrum.

How can you tell one element from another?

You should wear these type of gloves to protect yourself from electrical sparks. True or False

Water is able to dissolve many substances because of its A. state. B. viscosity. C. polarity. D. solubility.

What moon phase are we in today?

Define the following: a) sound b) vibration c) sound waves d) frequency

A motorist driving at 25 meters/second decelerates to 15 meters/second. The combined mass of the vehicle and the driver is 1.5 * 10³ kilograms. What is the amount of mechanical work done by the vehicle?

All forces are different each exerts a particular type of effect on an object

Witch statement about polymers is true

Two bullets have masses of 3,0 g and 6.0g, respectively. both are fired with a speed of 40.0 m/s. Which bullet has more kinetic energy? What is the ratio of their kinetic energies

What does it mean that a form of energy might take more energy to harness than it provides? Are renewable resources always renewable, or can they become non-renewable? Why aren't renewable resources used for everything that we use energy for?