Question

State any four main characteristics of electromagnetic waves. The speed of light is
3 x 10 m/s. Calculate the frequency of red light of wavelength of 6.5 x 10-7m​

Answer 1

Answer:

1. They are transverse waves.

2. They do not require any material medium to travel.

3. They have electric and magnetic fields perpendicular to each other and perpendicular to the direction of the propagation of waves.

4. They all travel at a speed of $3 X 10^8 m/s$

Let frequency be x

Wave velocity = wavelength x frequency

$3 X 10^8 = 6.5 X10^{-7} X x\\x = \frac{3 X 10^8}{6.5 X 10^{-7}}\\x = 4 X 10^{14} Hz$