Electrons in excited hydrogen atoms are in the

n = 3 energy level. How many different photon

frequencies could be emitted as the atoms return

to the ground state?

(1) 1 (3) 3

(2) 2 (4) 4

Most metals are not? A ductile B good conductors if heat and electric C liquid at room temperature D mellable

The position of a certain airplane during takeoff is given by x=1/2 * bt2, where b = 2.0 m/s2 and t = 0 corresponds to the instant at which the airplane's brakes are released at position x = 0.

A horse moves a sleigh 1.00 kilometers by applying a horizontal 2000 Newton force on its harness for 45 minutes. what is the power of the horse?

The planets are pulled towards the sun by?

Which is likely to have a greater mass a cubic centimeter of titanium, or the same volume of zirconium?

Three resistors, R1 = 10 Ω, R2 = 20 Ω and R3 = 30 Ω are connected in series to a 12 V battery. Find: a. The equivalent resistance of the circuit. b. The current in each resistor. c. The voltage across each resistor. d.

What are the basic rules of basketball? Are the rules different for men's versus women's competition?

A note is being played on a string on a guitar. The string is then pushed to the side while still in contact with the same fret. What happens to the frequency of the note then played compared to the original note?

What would you predict about a chemical that has a hydrogen ion concentration of 1 * 10-12 M? It will form salt and water when added to a base. It contains no hydroxide ions. It has high concentration of hydroxide ions. It has a sour taste.

What are the three theories of light?