Quick Answer: What Is A Wave Class 9?

What is the best definition of a wave?

A wave is a physical phenomenon characterized by its frequency, wavelength, and amplitude.

In general, waves transfer energy from one location to another, in which case they have a velocity.

Longitudinal waves, such as sound, oscillate parallel to the direction of energy transfer..

What type of word is Wave?

wave noun [C] (WATER) a raised line of water that moves across the surface of an area of water, especially the sea: At night, I listened to the sound of the waves breaking/crashing against the shore. A large wave swept away half the sandcastle.

What causes wave?

Waves are most commonly caused by wind. Wind-driven waves, or surface waves, are created by the friction between wind and surface water. As wind blows across the surface of the ocean or a lake, the continual disturbance creates a wave crest. … The gravitational pull of the sun and moon on the earth also causes waves.

What are the characteristics of sound class 9?

Sound wave can be described by five characteristics: Wavelength, Amplitude, Time-Period, Frequency and Velocity or Speed.Wavelength. Source: www.sites.google.com. … Amplitude. … Time-Period. … Frequency. … Velocity of Wave (Speed of Wave)

What is Wave and examples?

Wave is a flow or transfer of energy in the form of oscillation through a medium – space or mass. Sea waves or tides, a sound which we hear, a photon of light travelling and even the movement of small plants blown by the wind are all examples of different types of waves.

What is a wavelength and frequency?

frequency: Is the number of waves that pass a certain point in a specified amount of time. trough: The low point of the wave cycle. wavelength: The distance between two successive peaks.

What is pitch class 9?

Pitch: Frequency determines the shrillness or the pitch of the sound. Higher the frequency, higher the pitch or it is said that the sound is shrilling. Lower the frequency, lower the shrill or pitch. Eg: Babies voice has more frequency and thereby more shrilling than an adult voice.

What is Wave explain?

Waves involve the transport of energy without the transport of matter. In conclusion, a wave can be described as a disturbance that travels through a medium, transporting energy from one location (its source) to another location without transporting matter.

What is sound wave Class 9?

Sound is a mechanical energy which produces sensation of hearing. Sound is produced due to vibration of different objects. • Sound wave propagates as compressions & rarefactions in the medium.

Why do we fall ill Class 9 notes?

It may be caused due to the attack of pathogens (virus, bacteria), lack of nutritious diet/balanced diet and lack of public health services. The disease which lasts for only a short period of time is called Acute Disease. For example: Influenza (Flu), Common cold, etc.

What is wavelength Class 9?

Class 9 Physics Sound. Wavelength Frequency Time Period. Wavelength, Frequency, Time Period. Wavelength: The distance between 2 consecutive crest or troughs is called Wavelength. It is represented by the symbol λ(lamda).

What are 2 types of waves?

Waves come in two kinds, longitudinal and transverse. Transverse waves are like those on water, with the surface going up and down, and longitudinal waves are like of those of sound, consisting of alternating compressions and rarefactions in a medium.

What are the 7 types of waves?

The electromagnetic spectrum includes, from longest wavelength to shortest: radio waves, microwaves, infrared, optical, ultraviolet, X-rays, and gamma-rays.

What is a full wavelength?

The wavelength is the distance from crest to crest (or from trough to trough) (or between any two corresponding points on adjacent waves). 2. … The amplitude is the distance from rest to crest or from rest to trough. 3. Indicate the interval that represents one full wavelength.

What is the wavelength of the wave?

Description: Wavelength is the distance from one crest to another, or from one trough to another, of a wave (which may be an electromagnetic wave, a sound wave, or any other wave). Crest is the highest point of the wave whereas the trough is the lowest. … This means the longer the wavelength, lower the frequency.