Question

Red light has a longer wavelength and higher energy than blue light. True or False

Answer 1

The statement is false; red light has a longer wavelength and lower energy compared to blue light, as energy increases with higher frequency and shorter wavelength.

Step-by-step explanation:

The statement that red light has a longer wavelength and higher energy than blue light is False. In the electromagnetic spectrum, red light actually has the longest wavelengths and the lowest frequencies, which means it has lower energy compared to blue light. Blue light has shorter wavelengths and higher frequencies, leading to higher energy. For example, violet light, which is close to blue in the spectrum, even has higher frequencies and shorter wavelengths than blue, endowing it with the most energy in the visible spectrum. Therefore, the correct relationship according to the properties of light is that a longer wavelength corresponds to lower energy, and a shorter wavelength corresponds to higher energy.

To summarize the relationship: The sequence from red to blue to violet light in the visible spectrum shows an increase in frequency and a decrease in wavelength. As the frequency increases, so does the energy of the light. Therefore, red light, with its longest wavelength in the visible spectrum, has less energy compared to blue light, which has a shorter wavelength and higher frequency.

Answer 2

False

Step-by-step explanation:

Visible light is composed of radiation of wavelengths between 400 and 700 nm. The sensitivity of the human eye depends on the wavelength and has a maximum at 550 nm. Some people are able to perceive from 380 to 780 nm.

The electromagnetic energy in a particular wavelength λ (in a vacuum) has an associated frequency f and a photonic energy E. Thus, the electromagnetic spectrum can be expressed in terms of any of these three variables, which are related by equations.

Thus, high frequency electromagnetic waves have a short wavelength and high energy; Low frequency waves have a long wavelength and low energy.

To calculate the energy of a photon the Planck formula is used is E = h · v, where E is the energy, h the Planck constant and v the frequency (Hz or s-1). Where the frequency f is equal to the speed of the wave, divided by the wavelength λ .

That said we can say that it is false because although the red light has a longer wavelength than the blue one, in turn it has a lower energy than the blue light.