An electron in the n = 7 level of the hydrogen atom relaxes to a lower energy level, emitting light of 397 nm. what is the value of n for the level to which the electron relaxed?

A) You push against a box; it doesn't move. Is the net force of the box in this situation balanced and at zero? Or is it unbalanced?

How is the ideal mechanical advantage of a wheel and axel calculated

How do you express 78,000 in scientific notation? 7.8 x 103 7.8 x 104 7.8 x 10-4

What are the basic properties of matter

A 2.00-kg box is suspended from the end of a light vertical rope. A time-dependent force is applied to the upper end of the rope, and the box moves upward with a velocity magnitude that varies in time according to v (t) = (2.00m/s2) t + (0.

An elevator (mass 4150 kg) is to be designed so that the maximum acceleration is 0.0800g. what is the maximum force the motor should exert on the supporting cable?

Car batteries are often rated in ampere-hours. Does this information designate the amount of (a) current, (b) power, (c) energy, (d) charge, or (e) potential the battery can supply?

If an airplane flies at 364 km/h, how long will it take to get from New York to Washington DC (288 km) ? (If needed, round to the nearest thousandths and answer with unit 'h' for hours.)

If a bar magnet is broken into two pieces, each of the resulting pieces

Two passengers leave the airport at Kansas City, Missouri. One flies to Los Angeles, California, in 3.5 hr and the other flies in the opposite direction to New York City in 3.5 hr.