A. Gamma rays (wave length < 10-10 m)
B. Ultraviolet rays (wave length < 10-6 m)
C. Infrared rays (wave length < 10 -4 m)
D. All of these
Related Mcqs:
- The entire range of the electromagnetic spectrum spans a large spectrum of wave lengths varying from__________________?
A. 10-10 to 106 m
B. 10-8 to 106 m
C. 10-10 to 1010 m
D. 10-8 to 108 m
- In case of reflection and refraction of electromagnetic radiation ?
A. Angle of incidence = angle of refraction
B. Angle of incidence = angle of reflection
C. Angle of refraction = sum of the angles of incidence and refraction
D. All the above - Which one of the following statement is incorrect regarding the electromagnetic radiation ?
A. These are produced by the motion of electric charge
B. The oscillation of charged particles sets up changing electric fields
C. The changing electric fields induce the changing magnetic fields in the surrounding medium
D. None of these - According to the Snell’s law if an electromagnetic wave is incident in a medium (refractive index n1) on another medium (refractive index m2)________________?
A. The angle of incidence is equal to the angle of refraction
B. The angle of refraction r) is given by sin i
C. Both A. and B.
D. Neither A. nor B. - Critical angle of electromagnetic radiation takes place if__________________?
A. Angle of incidence is equal to angle of refraction
B. Angle of incidence is greater than the angle of refraction
C. Angle of incidence is equal to 90°
D. Angle of refraction is equal to 90° - Electromagnetic radiation_______________?
A. Produces a time varying magnetic field and vice versa
B. Once generated, remains self-propagating
C. Is capable to travel across space
D. All of these - Which on speed C. of the electromagnetic wave is correct ?
A. C = v
B. C = /v
C. C = v
D. C = 1/ - If electric permittivity and magnetic permeability of the medium are respectively and , then the velocity (Cm) of the electromagnetic wave in the medium is given by___________________?
A. Cm = 1/
B. Cm
C. Cm
D. None of these - “An Electromagnetic wave falls on to a boundary between two losses less homogeneous media with different refractive indices, a part of the wave is reflected back to the incident medium and the rest is transmitted on to the second media”. This phenomenon is known as___________________?
A. Fresnel reflection
B. Fresnel refraction
C. Snell’s law
D. None of these - The spectral region of the electromagnetic radiation which passes through the atmosphere without much attenuation is known as__________________?
A. Ozone hole
B. Atmospheric window
C. Ozone window
D. Black hole
