Failed to connect to MySQL: Access denied for user 'examnext_online'@'localhost' (using password: YES) An electromagnetic wave of frequency 3 MHz passes from vacuum into a dielectric medium with permitivity `epsilon_r =4` , then - Sarthaks eConnect

An electromagnetic wave of frequency 3 MHz passes from vacuum into a dielectric medium with permitivity `epsilon_r =4` , then

An electromagnetic wave of frequency 3 MHz passes from vacuum into a dielectric medium with permitivity `epsilon_r =4` , then

A.

the wavelength and frequency both remain unchanged

B.

the wavelength is doubled and the frequency remains unchanged

C.

the wavelength is doubled and the frequency becomes half

D.

the wavelength is halved and the frequency remains uchanged