What is the frequency if 140 waves pass in 2 minutes?

If an atom of nitrogen binds with three hydrogen atoms to form a molecule of ammonia, how many lone pairs of electrons does nitrogen have?

The potential-energy function u (x) is zero in the interval 0≤x≤l and has the constant value u0 everywhere outside this interval. an electron is moving past this square well. the electron has energy e=6u0.

What did the results of photoelectric-effect experiments establish? A) Electrons are emitted as soon as low-intensity, high-frequency light hits a metal surface. B) Electrons are never emitted if low-intensity light waves strike a metal surface.

Postal worker on a bicycle travels at an average speed of 4m/s for 3 minutes. Work out how far she travelled.

Why do soilds have a fixed shape while liquids and gas do not

Dolphins and other sea creatures can leap to great heights by swimming straight up and exiting the water at a high speed. A 200 kg dolphin leaps straight up to a height of 7.8 m.

An example of renewable energy resource is ... A - uranium B - Wind C - natural gas

The power of a 1.5-volt alkaline cell varies with the number of hours of operation. A brand new D-cell can deliver as much as 13 A through a copper wire connected between terminals. Determine the power of a brand new D-cell.

You measure a watch's hour and minute hands to be 7.4 mm and 12.1 mm long, respectively. Part A In one day, by how much does the distance traveled by the tip of the minute hand exceed the distance traveled by the tip of the hour hand?

Describe the possible long term impact of a catastrophic event