Electromagnetic Waves - Online Test
Q1.
What physical quantity is the same for X-rays of wavelength m, red light of wavelength 6800A and radio waves of wavelength 500m?
Answer : Option C
Explaination / Solution:
No Explaination.
Q2. Plane electromagnetic wave travels in vacuum along z-direction. If the frequency of the wave is 30 MHz, its wavelength is
Answer : Option A
Explaination / Solution:
No Explaination.
Q3. 7.5 MHz to 12 MHz band corresponds to wavelength band of
Answer : Option A
Explaination / Solution:
No Explaination.
Q4. A charged particle oscillates about its mean equilibrium position with a frequency of Hz. Frequency of the electromagnetic waves produced by the oscillator is
Answer : Option D
Explaination / Solution:
No Explaination.
Q5. The amplitude of the magnetic field part of a harmonic electromagnetic wave in vacuum is = 510 nT. Amplitude of the electric field part of the wave is
Answer : Option B
Explaination / Solution:
No Explaination.
Q6. Suppose that the electric field amplitude of an electromagnetic wave is = 120 N/C and that its frequency is ν = 50.0 MHz , , k, and . are
Answer : Option D
Explaination / Solution:
No Explaination.
Q7. Use the formula E = hv (for energy of a quantum of radiation: photon) and obtain the photon energy in units of eV for for λ = 1 m
Answer : Option A
Explaination / Solution:
No Explaination.
Q8.
In a plane electromagnetic wave, the electric field oscillates sinusoidally at a frequency of Hz and amplitude 48 V .wavelength of the wave and amplitude of the oscillating magnetic field are
Answer : Option C
Explaination / Solution:
No Explaination.
Q9.
Suppose that the electric field part of an electromagnetic wave in vacuum is E = {(3.1 N/C) cos [(1.8 rad/m) y + (5.4 rad/s)t]} i . Wavelength , frequency ν and the amplitude of the magnetic field part of the wave are
Answer : Option D
Explaination / Solution:
No Explaination.
Q10. About 5% of the power of a 100 W light bulb is converted to visible radiation. What is the average intensity of visible radiation at a distance of 1m from the bulb and at a distance of 10 m are
Answer : Option A
Explaination / Solution:
No Explaination.
