Fred points a toy laser gun at a wall. considering that the frequency of the gun's light is 4.91 × 1014 hertz and that planck’s constant is 6.61 × 10-34 joule·seconds, what is the energy of the laser light?
a) 3.24 × 10-21 joules
b) 4.91 × 1015 joules
c) 2.04 × 10-21 joules
d) 4.92 × 10-18 joules

Aballoon is rising vertically upwards at a velocity of 10m/s. when it is at a height of 45m from the ground, a parachute bails out from it. after 3s he opens his parachute and decelerates ata a constant rate 5m/s.when. (a) what was the height of the parachutist above the ground when he opened his parachute? (b)how far is the parachutist from the balloon at t=3s? (c)with what velocity does the parachutist hit the ground? (d)after how long does the parachutist hit the ground after his exist from the balloon?

Which of the following is a characteristic shared by both electron and light microscopes? a. they both employ the use of objective lenses. b. both microscopes require an internal camera to visualize the specimen. c. both microscopes have a resolving power of 0.01 nm. d. they both utilize white light to magnify the specimen.

Calculate 9 ∙ 10-5 divided by 3 ∙ 10-9. (box after the "10" in answer is for the