Question

The waves with the longest wavelengths in the electromagnetic spectrum are

a. x-rays.
b. infrared rays.
c. gamma rays.
d. radio waves.

Answer 1

The waves with the longest wavelengths in the electromagnetic spectrum are D. Radio waves.

Answer 2

The correct choice is

d. radio waves.

For radio waves, wavelength is greater than 1 mm.

For infrared rays, wavelength lie in the range of 25 μm - 2.5 μm

For x- rays, wavelength lie in the range of 1 nm - 1 pm

For gamma rays, wavelength is less that 10⁻¹² m

From the above values of wavelengths, we see that radio waves have the longest wavelengths in the spectrum.