A trumpet creates a sound wave that has a wave speed of 360 m/s and a wavelength of 0.8 m. What is the frequency of the sound wave? A. 450.0 Hz, because frequency is equal to wave speed divided by wavelength

B. 280.0 Hz, because frequency is equal to wave speed multiplied by wavelength.

C. 0.002 Hz, because frequency is equal to wavelength subtracted from wave speed.

D. 70.0 Hz, because frequency is equal to wavelength multiplied by wave speed.

Which statement best describes copper? a. it has a low resistance and prevents charges from moving freely. b it has a high resistance and allows charges to move freely. c. it has a high resistance and prevents charges from moving freely. d. it has a low resistance and allows charges to move freely

Red light strikes a metal surface and electrons are ejected. if violet light is now used with a 10% greater intensity, what will happen to the ejection rate (number of ejected electrons per second) and the maximum energy of the electrons? a) greater ejection rate; same maximum energyb) same ejection rate; greater maximum energyc) greater ejection rate; greater maximum energyd) same ejection rate; same maximum energye) none of the above answers are correct

Astudent pushes on a 20.0 kg box with a force of 50 n at an angle of 30° below the horizontal. the box accelerates at a rate of 0.5 m/s2 across a horizontal floor. what is the value of the normal force on the box? 200 n 243 n 156 n 225 n