Question 1 of 20 If an electromagnetic wave has a frequency of 8 x 1014 Hz, what is its
wavelength? Use 1 = The speed of light is 3 x 108 m/s.
O A. 3.8 x 10-7m
B. 2.7 x 10-6 m
O C. 2.7 x 10m
O D. 3.8 x 1021 m

The of a machine determines its "usefulness." a. input force b. output force c. mechanical advantage

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

Calculate the ratio of h+ ions to oh– ions at a ph = 6. find the concentration of h+ ions to oh– ions listed in table b of your student guide. then divide the h+ concentration by the oh– concentration. record this calculated ratio in table a of your student guide. compare your approximated and calculated ratios of h+ ions to oh– ions at a ph = 6. are they the same? why or why not? record your explanation in table a. what is the concentration of h+ ions at a ph = 6? mol/l what is the concentration of oh– ions at a ph = 6? mol/l what is the ratio of h+ ions to oh– ions at a ph = 6? : 1