EASY
JEE Main
IMPORTANT
Earn 100
Given below are two statements :
Statement I: A time varying electric field is a source of changing magnetic field and vice-versa. Thus a disturbance in electric or magnetic field creates EM waves.
Statement II: In a material medium, the EM wave travels with speed .
In the light of the above statements, choose the correct answer from the options given below.
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Important Questions on Electromagnetic Waves
HARD
JEE Main
IMPORTANT
A radar sends an electromagnetic signal of electric field and magnetic field which strikes a target on line of sight at a distance of in a medium. After that, a part of signal (echo) reflects back towards the radar with same velocity and by same path. If the signal was transmitted at time from radar, then after how much time echo will reach to the radar?
EASY
JEE Main
IMPORTANT
An EM wave propagating in -direction has a wavelength of . The electric field vibrating -direction has maximum magnitude of . Choose the correct equations for electric and magnetic fields if the EM wave is propagating in vacuum :
EASY
JEE Main
IMPORTANT
Match List I and List II
| List I | List II | ||
| A | Microwaves | I | Physiotherapy |
| B | UV rays | II | Treatment of cancer |
| C | Infra-red rays | III | Lasik eye surgery |
| D | X-rays | IV | Aircraft navigation |
Choose the correct answer from the option given below:
EASY
JEE Main
IMPORTANT
Match the List-I with List-II:
| List I | List II | ||
| A | Microwaves | I | Radioactive decay of the nucleus |
| B | Gamma rays | II | Rapid acceleration and deceleration of electron in aerials |
| C | Radio waves | III | Inner shell electrons |
| D | X-rays | IV | Klystron valve |
Choose the correct answer from the options given below:
