Question

10 multiple choice 2 points what would be the best use for a material that reflects almost all light? as a mirror as a window as a light bulb as a sheet of paper 11 multiple choice 2 points the diagram below shows the electromagnetic spectrum. electromagnetic spectrum gamma rays x - rays ultraviolet visible light infrared microwaves radio compared to a photon of x - ray radiation, a photon of infrared radiation has a longer wavelength and less energy. a longer wavelength and more energy. a shorter wavelength and less energy. a shorter wavelength and more energy. 12 multiple choice 2 points which of the following statements best describes the visible spectrum of light as seen by the human eye? the lowest frequency appears red, and the highest frequency appears violet. the lowest frequency appears red, and the highest frequency appears yellow. the lowest frequency appears green, and the highest frequency appears violet. the lowest frequency appears green, and the highest frequency appears yellow

Explanation:

• Question 10: Mirrors are designed to reflect light. Windows transmit light, light - bulbs emit light, and paper scatters light. A material that reflects almost all light is best used as a mirror.
• Question 11: In the electromagnetic spectrum, as we move from gamma rays to radio waves, the wavelength increases and the energy of a photon (\(E = h

u=\frac{hc}{\lambda}\), where \(h\) is Planck's constant, \(c\) is the speed of light, \(
u\) is frequency and \(\lambda\) is wavelength) decreases. X - rays have a shorter wavelength than infrared. So, a photon of infrared radiation has a longer wavelength and less energy.

• Question 12: In the visible spectrum, red light has the lowest frequency (\(

u\)) and violet light has the highest frequency. Using the relation \(c=
u\lambda\) (where \(c\) is the speed of light), lower frequency means longer wavelength and vice - versa.

Answer:

1. as a mirror
2. a longer wavelength and less energy
3. The lowest frequency appears red, and the highest frequency appears violet.