Which one of the following types of electromagnetic radiation causes certain substances to fluoresce?
a. cosmic rays
b. ultraviolet rays
(c. x rays)
d. infrared waves
a virtual image produced by a lens is always
a. located in front of the lens.
(b. located in the back of the lens.)
c. smaller than the object.
d. larger than the object.
reflecting telescopes are popular because they're
a. more durable than a refracting telescope.
b. more powerful than a refracting telescope.
c. easier to build than a refracting telescope.
(d. smaller than a refracting telescope.)
the unit for measuring the rate at which light energy is radiated from a source is the
a. lux.
b. lumen.
(c. candela.)
d. angstrom
a magnifying glass is an example of a lens.
a. plano-concave
(b. plano-convex)
c. double-concave
d. converging
my answer is in ( ) and the answers are wrong tell me the correct answer because i dont have a clue

You and a friend (alex) are at a a tree-top adventure park .. . part of the course requires you to climb up a rope. you both climb the same rope in the same amount of time. however, the tension in the rope is greater when alex climbs. who did the most work? alex did - more tension means more force - more force means more work was done you did - less tension means less force - less force means more work was done to find the work done, the force exerted and distance moved are multiplied. a couch is moved twice before you are happy with its placement. the same force was used to move the couch both times. if more work is done the first time it is moved, what do you know about the distance it was moved? when more work was done, the couch was moved less. when more work was done, the couch was moved further. when more work was done, the couch wasn't moved at all. when more work was done, the couch was moved the same distance.

(**i would really appreciate if this was answered soon** ) which pair of quantities includes one quantity that increases as the other decreases during simple harmonic motion?

Arrange the images in order to show how lake-effect snow occurs.