Photons with energy of 3 eV hit a metal plate in a photoelectric effect apparatus. The metal plate has a workfunction of 5 eV. Group of answer choices Photoelectrons of 5 eV will be generated. Photoelectrons will not be generated. Photoelectrons with enegies of 2 eV will be generated. Photoelectrons of -2 eV will be generated.

An insulated 40 ft^3 rigid tank contains air at 50 psia and 120°f. a valve connected to the tank is now opened, and air is allowed to escape until the pressure inside drops to 25 psia. the air temperature during this process is kept constant by an electric resistance heater placed in the tank. determine the electrical work done during this process.

A10 kg box initially at rest is pulled 18 meters across a horizontal, frictionless surface by a 40 n force. what is the block’s final velocity over the 18 meters?

Adolphin emits ultrasound at 100khz and uses the timing of reflections to determine the position of objects in the water. part a what is the wavelength of this ultrasound? assume that temperature of water is 20 degrees c. answer in cm