Ripples
Concept of Wave
A wave is a disturbance in a medium that carries energy without a net movement of particles.
It appears in the form of oscillations when they pass through any medium (in case of water waves or sound waves) or without any medium (in case of electromagnetic waves). They are present around us in both visible and invisible forms. Some of the types of waves are light waves, radio waves, sound waves etc. We will discuss the Light waves later in detail. An individual is completely dependent on a wide range of waves for wireless communications. Eg:-When you call your friend, then the entire communication on the phone happens through the transmission of waves. The communication from the sender to the receiver appears in the form of a waveform. Your phone converts the received voice signal into an electrical signal. Later, these electric signals travel either wirelessly or via copper wires to the receiver through an antenna. In this way, waves help in communication between people.
Types of Waves
Waves occur in various forms.
Mechanical Waves
Transverse waves
Longitudinal waves
Electromagnetic waves
Matter Waves
Transverse wave-
Longitudinal waves
Answer the following questions
What will be the frequency (ʋ) of wave with wavelength (λ) of 400nm and the colour obtained. Option-
6x$10^3$ Hz & yellow colour
75x$10^{18}$ Hz ,Red colour
7.5x$10^{14}$ Hz ,Violet colour (d)4 Hz, Blue colour
Find the wavelength(λ) of a wave having frequency 2x $10^2$ Hz. Find whether wave is in visible range or not? Option-(a) 6x$10^3$ m , visible radiation
0.1x$10^{-7}$m, no visible, X-rays (c) 7.5x$10^{14}$ m ,Red visible (d)1.5x$10^6$m, no visible, long radio waves
For a wave having sixteen full wave cycles, find the frequency. Option-(a) 16 Hz (b) 1/16 Hz (c) 1.6 Hz (d)60 Hz