Question

Which of the following effect is not related to the electromagnetic waves?
1. Doppler effect
2. Magnus effect
3. Interference
4. Diffraction

Answer 1

Correct Answer - Option 2 : Magnus effect

CONCEPT:

Doppler effect:

• Doppler shift is also known as the Doppler effect is defined as the change in the wavelength or frequency of the waves with respect to the observer who is in motion relative to the wave source.
• The phenomenon was described in the year 1842 by the Austrian physicist Christian Doppler.
• This phenomenon is used to find the velocity of the star with respect to the earth.

Interference:

• When two waves superimpose then the resultant amplitude of the wave at that point is the vector sum of amplitudes of each individual wave. This phenomenon is called the interference of waves.

Diffraction:

• The phenomenon of bending of waves around the corners of an obstacle/aperture of the size of the wavelength of waves is called diffraction.

Magnus effect:

• The force exerted on a rapidly spinning cylinder or sphere moving through air or another fluid in a direction at an angle to the axis of spin is called the Magnus effect.
• This force is responsible for the swerving of balls when hit or thrown with spin.

EXPLANATION:

• From the above explanation, it is clear that the Magnus effect is not shown by the waves.
• Hence, option 2 is correct.