Calculate the energy and frequency of the radiation with a wavelength of 500 nm.​

20. threshold braking in the vehicle's braking system occurs when a. the brake pedal is pushed, heel on floorboard, with full foot pressure. b. the brakes are exerting full braking power, without traction loss. c. the driver begins pushing down the brake pedal, with moderate slowdown. d. the brakes just begin to take hold with a gradual slowdown.

What happens when a rubber rod is rubbed with a piece of fur?

The discovery of the electron as a subatomic particle was a result of