What is the frequency of an electromagnetic wave that has a wavelength of 4,000m?

What is the difference between a continuous spectrum and a line spectrum

If a 500µF can store 0.02J of energy, what must the voltage supplied to the capacitor be

A 555 g ball strikes a wall at 14.9 m/s and rebounds at 12.1 m/s. The ball is in contact with the wall for 0.044 s. What is the magnitude of the average force acting on the ball during the collision?

In which layer can air temperatures reach 1,800c

A stuntman of mass 55 kg is to be launched horizontally out of a spring- loaded cannon. The spring that will launch the stuntman has a spring coefficient of 278 N/m and is compressed 4 m prior to launching the stuntman.

In tae-kwon-do, a hand is slammed down onto a target at a speed of 10.5 m/s and comes to a stop during the 2.13 ms collision. Assume that during the impact the hand is independent of the arm and has a mass of 0.400 kg.

If you looked at the frequently spectrums of two friends saying the word dog, would they look the same or different ?

Which of the following atoms has the smallest radius? The Periodic Table

When do centromeres split

Who passes on dyslexia the mother or the father