A block with length of 1.5m, width 1=1m, height=0.5m and mass 300kg. what is the pressure at the bottom surface of the block

Which type of electromagnetic waves are dangerous enough to be used to kill cancerous cells? (a)gamma rays (b)visible light (c)infrared light (d)microwaves

An observer that stands still as the electron moves by him, will observe

Which statement correctly describes the relationship between frequency and wavelength?