A high school website directs parents to not allow student access to blue laser pointers or allow the students to bring them to school. It includes a video describing the danger inherent in the misuse of all laser pointers particularly the blue laser pointer. What best supports the claim that blue laser pointers are more of a concern than red laser pointers?
A) Colored light falls into the visible region and the red light has a smaller wavelength and higher energy than blue light.
B) The wavelengths and energies differ. The ultraviolet blue light has a larger wavelength and smaller energy compared to infrared.
Eliminate
C) Both wavelengths fall into the visible light region but blue light has a smaller wavelength and higher energy than red light.
D) These colors have similar wavelengths but the blue laser light has more energy than red laser light making it more dangerous.

An atom of sodium-23 (atomic number = 11) has a positive charge of +1. give this information, how many electrons does it have? how many proteins and neutrons does this atom have

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.

The last few miles of the marathon are the most difficult for heather, her hair plastered to her head, sweat clinging to her arms, and her legs already feeling as if they had nothing left, just dead weight. after grabbing a cup of ice water, she feels the ice cubes smash against her nose as she gulps some cool refreshment and keeps on running. in these last few miles, the breeze kicks up and she finally feels some coolness against her skin. drips of sweat, once clinging to her forehead, now spill down, and heather feels more pain as the sweat flows into her eyes.which of the following is the most likely reason why the ice struck heather’s nose when she took a drink? a) water can function as a solvent. b) water can store large amounts of heat. c) water can moderate temperatures through evaporative cooling. d) the density of water decreases when it freezes. e) water has a cohesive nature.sweat remained on heather’s forehead and arms because of the a) high salt content of sweat b) cohesive nature of water c) ability of water to moderate heat d) high evaporative cooling effect of water e) ability of water to act as a solvent