Which of the following statements is/are correct?
(a) Microwaves are produced by klystron valves.
(b) Radio waves are produced by inner shell electrons when they move from one energy level to a lower energy level.
Klystron valves are used to amplify high-frequency microwaves. These devices are capable of producing microwave frequencies and are commonly used in applications such as radar, satellite communication, and microwave ovens.
Which of the following statements is/are correct?
(a) Electromagnetic waves have different speeds in different mediums.
(b) Sounds have different speeds in different mediums.
Which of the following statements is/are correct?
(a) Infrared waves are produced by hot bodies.
(b) Sun is an important source of ultraviolet light.
Which of the following electromagnetic waves/rays has the minimum frequency?
Microwaves, Radio waves, Ultraviolet rays, X-rays
An EM wave has energy of the order of 20 eV. Which part of the EM wave spectrum does it belong to?
The frequency of an electromagnetic (EM) wave is 6 × Hz. The wavelength of the EM wave is _________, and it falls in the range ___________.
The magnetic field in a plane electromagnetic wave is given by = 0.2 μ T sin (8π × z + 6π × t). Then the electric field of the wave is:
A plane electromagnetic wave travels in vacuum along z-direction. Then which of the following statements is true for the electric and magnetic field vector?
Which of the following statements is/are correct?
(a) Microwaves are produced by klystron valves.
(b) Radio waves are produced by inner shell electrons when they move from one energy level to a lower energy level.
Consider gamma rays, X-rays and UV rays travelling in a vacuum. All of these are traveling with __________.
The electric field of a plane electromagnetic wave oscillates sinusoidally with a frequency of 2.0 × Hz and an amplitude of 60 . The wavelength (in cm) of the wave is (c = 3 × ):
