What unit is used to measure the period of a wave

At room temperature, most of the atoms of atomic hydrogen contain electrons that are in the excited states. A tube is filled with atomic hydrogen.

In a parallel circuit, if bulb #2 were to blow out, bulb #1 would stay lit or go out?

Where are the longest continuous mountain ranges on Earth located?

How do scientists look for black holes in the sky

If a bicyclist travels 42 miles in 3.2 hours, what was her average speed?

What are optical fibres

Where in the body does neutral, acidic and basic (alkaline) solutions usually exist?

What is the current in a circuit with a 12.0 V battery and a 4.0 Ω resistor?

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?