class problems

Last updated 2023.01.17 Edit Source

• Physics
• Wave
• Oscillaiton
• Equation

Missing wavelength
$f=200Hz$
$c=340Hz$
$\lambda=?$
$$c=\lambda\cdot f$$
$$\lambda=\frac{c}{f}=>\frac{340Hz}{200Hz}$$
$$\lambda=1.7m$$

Missing period
What is the period of red light?
$\lambda=700nm=700\cdot 10^{-9}m$
($c=3\cdot 10^8m/s$)
$T=?$
$$c=\frac{\lambda}{T}$$
$$T=\frac{\lambda}{c}=>\frac{700\cdot 10^{-9}m}{3\cdot 10^8m/s}$$
$$T=2.33\cdot 10^{-15}s$$