Question

pregunta 4 (4 puntos)
(02.04 mc)
compared to infrared radiation, an electromagnetic wave that has a lower frequency will also have a

a longer wavelength and lower speed

b longer wavelength and equal speed

c shorter wavelength and lower speed

d shorter wavelength and equal speed

pregunta 5 (4 puntos)
(02.04 mc)
what is the wavelength of waves that have a frequency of 2.20 x 10^(-4) hz?

a 7.30 x 10^(-13) m

b 6.60 x 10^4 m

c 5.50 x 10^8 m

d 1.36 x 10^12 m

Explanation:

Step1: Recall wave - frequency and wavelength relationship

The speed of an electromagnetic wave in a vacuum $c$ is constant ($c = 3\times10^{8}\ m/s$), and the relationship between the speed $c$, frequency $f$, and wavelength $\lambda$ is $c=\lambda f$. So, $\lambda=\frac{c}{f}$. When the frequency $f$ decreases, the wavelength $\lambda$ increases because $c$ is constant for electromagnetic waves in a vacuum. All electromagnetic waves travel at the speed of light in a vacuum regardless of their frequency.

Step2: Solve for wavelength in Pregunta 5

We know that $c = 3\times10^{8}\ m/s$ and $f=2.20\times 10^{- 4}\ Hz$. Using the formula $\lambda=\frac{c}{f}$, we substitute the values: $\lambda=\frac{3\times 10^{8}\ m/s}{2.20\times 10^{-4}\ Hz}\approx1.36\times 10^{12}\ m$.

Answer:

Pregunta 4: B. longer wavelength and equal speed
Pregunta 5: D. $1.36\times 10^{12}\ m$