The military is proposing to use high-power laser as part of an anti-drone weapon. when it is used in the earth's atmosphere, the light's electric field could ionize the air (and waste power) if the electric field exceeds a peak magnitude of 3 x 10 v/m, so it's being designed with a peak electric field of 2.0 x 10 v/m. a) what average laser beam intensity will produce this magnitude of peak electric field b) at this intensity, what is the laser's power if it is focused into a circular beam of radius 0.5 cm? c) what force does this beam exert on a flat object that absorbs 100% of the incident light? note that pressure = force/area. d) how much energy is transferred to a flat object that absorbs 100% of the incident light, if the laser remains on the target for 1.0 s?

The particle in a two-dimensional well is a useful model for the motion of electrons around the indole ring (3), the conjugated cycle found in the side chain of tryptophan. we may regard indole as a rectangle with sides of length 280 pm and 450 pm, with 10 electrons in the conjugated p system. as in case study 9.1, we assume that in the ground state of the molecule each quantized level is occupied by two electrons. (a) calculate the energy of an electron in the highest occupied level. (b) calculate the frequency of radiation that can induce a transition between the highest occupied and lowest unoccupied levels. 9.27 electrons around the porphine ring (4), the conjugated macrocycle that forms the structural basis of the heme group and the chlorophylls. we may treat the group as a circular ring of radius 440 pm, with 20 electrons in the conjugated system moving along the perimeter of the ring. as in exercise 9.26, assume that in the ground state of the molecule quantized each level is occupied by two electrons. (a) calculate the energy and angular momentum of an electron in the highest occupied level. (b) calculate the frequency of radiation that can induce a transition between the highest occupied and lowest unoccupied levels.

Which statement is best supported by the information in the chart? wave y is moving the fastest. wave x is moving the fastest. all of the waves are moving at the same speed. all of the waves have the same value of wavelengths per second.

Which accurately compares concave and convex lenses?