Purple light has a frequency of 4x10^14 Hz. What is the wavelength in meters?

Astring that is fixed at both ends has a length of 1.05 m. when the string vibrates at a frequency of 91.0 hz, a standing wave with five loops is formed. (a) what is the wavelength of the waves that travel on the string? (b) what is the speed of the waves? (c) what is the fundamental frequency of the string?

How many molecules are present in 3 mols of silicon dioxide (sio2)?

For the car in the picture ,in which direction is the normal force? -into the screen -down -out of the screen -up