The wavelength of a wave is 1.5 m and its speed is 6 m/s. What is the frequency?
If the wavelength increases to 3 m, what happens to the velocity and frequency?

What are similarities and differences between refraction, reflection, diffraction and absorption?

Light traveling in water, nwater = 1.33, strikes a plastic block at an angle of incidence of 51.4°; part of the beam is reflected and part is refracted. if the index of refraction of the plastic is 2.0, what is the angle made by the reflected and refracted beams?

If the work required to stretch a spring 3 ft beyond its natural length is 15 ft-lb, how much work is needed to stretch it 27 in. beyond its natural length?