HELPP Figure 2 shows an electronic balance measuring the mass of a beaker before and alter adding liquid into it.
250 cm3
250 cm3
44.48g before
128.98g after
Which of the following best describes the density of the liquid?

fiber-optic cable is composed of two concentric layers, called the core and the cladding, as illustrated in Figure 3-1. The core and cladding have different refractive indices, with the core having a refractive index of n1, and the cladding having a refractive index of n2. The index of refraction is a way of measuring the speed of light in a material. Light travels fastest in a vacuum. The actual speed of light in a vacuum is 300,000 kilometers per second, or 186,000 miles per second.