# How can the speed of ripples in a ripple tank be changed?

Method. Set up the ripple tank as shown in the diagram with about 5 cm depth of water. Adjust the height of the wooden rod so that it just touches the surface of the water. Switch on the lamp and motor and adjust the speed of the motor until low frequency waves can be clearly observed.

## What happens to waves that move through a barrier with a small opening?

Diffraction: A wave encountering a small obstacle tends to bend around the obstacle. This bending of the wavefront is called diffraction. When a wave encounters a barrier with an aperture, which is much smaller than the wavelength, the wave bends and spreads out as a spherical circular wave.

## What creates the waves in the ripple tank?

Ripples may be generated by a piece of wood that is suspended above the tank on elastic bands so that it is just touching the surface. Screwed to wood is a motor that has an off centre weight attached to the axle. As the axle rotates the motor wobbles, shaking the wood and generating ripples.

## What do the dark and bright fringes on ripple tank?

The waves will be seen in bright and dark patches on the screen below the tray. These patches show the position of the crests and troughs of the waves. The dark patches will correspond to the crests and bright patches will be the troughs.

## How is wave speed calculated?

Wave speed is the speed at which a wave travels. Wave speed is related to wavelength, frequency, and period by the equation wave speed = frequency x wavelength.

## Why do larger wavelengths diffract more?

The greater the wavelength the heavier the wave. If you think of it visually, the heavier the wave the more energy needed to move the wave in a different direction. As a result, the greater the wavelength, less diffraction.

## What is the bending of a wave called?

Refraction is the “bending of waves” .

## What happens if the gap is smaller than the wavelength?

When the gap size is smaller than the wavelength (top movie), more diffraction occurs and the waves spread out greatly – the wavefronts are almost semicircular.

## How do you calculate wavelength and frequency?

1. Use a photometer to measure the energy of a wave.
2. Convert the energy into joules (J).
3. Divide the energy by Planck’s constant, 6.626 x 10-34, to get the frequency of the wave.
4. Divide the speed of light, ~300,000,000 m/s, by the frequency to get wavelength.

## What is the distance between two wavefronts?

The distance between two consecutive wavefronts represents the wavelength of the sound wave. The frequency of the wave can be measured by counting the number of wavefronts detected by the observer over a period of time.

## What are the variables in a ripple tank experiment?

Measure the frequency, wavelength and speed of waves in a ripple tank. A ripple tank can be used to measure and calculate frequency, wavelength and the speed of waves on the surface of the water.

## What are the main parts of ripple tank?

• Power supply – Generate electricity to the motor.
• Motor – Moves the dipper in and out of water.
• Dipper – An object used to create water waves in the tank. It can be any shape, length and width.
• Tank – Water is poured inside here.

## What are the properties of ripple tank?

The ripple tank can be used to study almost all the wave properties: reflection, refraction, interference and diffraction. In addition to this, the wave phase velocity can be investigated at different water depths and in the presence of obstacles of various shapes.

## Why are the sides of a ripple tank sloped?

A ripple tank, the tank is shallow transparent tray of water with sloping side. The slopes prevent waves reflecting off the sides of the tank. Why are the sides of a ripple tank sloped? If they weren’t sloped and the waves reflected, it would be difficult to see the waves.

## How bright and dark bands are formed on the screen of the ripple tank?

The dark and light bands formed on the screen owing to the refraction of light. As shown in figure above, when the light from the light house passes through the area around the peak of a wave, the light will be converged and form a bright band on the screen.

## What would happen if the sides of a ripple tank were vertical?

the sides of a ripple tank are sloped because the Slopes prevent reflection at sides of tank. b if the sides of the ripple tank were vertical instead of sloped then the wave would reflect, making it hard to see incident waves.

## What causes a wavy pattern of dark and light bands on the bottom of a pond?

This pattern is called the wave interference pattern and is characterized by light and dark bands. The light bands are a result of constructive interference and the dark bands occur because of destructive interference. In the early 1800s, light was assumed to be a particle.

## What does λ mean in physics?

Wavelength is usually denoted by the Greek letter lambda (λ); it is equal to the speed (v) of a wave train in a medium divided by its frequency (f): λ = v/f.

## What is the formula for wave?

The constant velocity of a wave can be found by v=λT=ωk. v = λ T = ω k .

## What unit is wave speed?

Velocity: The distance traveled by a wave shape divided by the time taken to travel that distance. Also called wave speed. Symbol v. Units are meters/second (ms-1).

## Which Colour Diffracts the most?

In the visible wavelengths of the electromagnetic spectrum, red, with the longest wavelength, is diffracted most; and violet, with the shortest wavelength, is diffracted least. Because each color is diffracted a different amount, each color bends at a different angle.

## Does decreasing frequency increase diffraction?

Frequency is an invariable entity after the diffraction, i.e., the frequency of the incident wave does not change when the wave gets diffracted. However, the amount of diffraction depends on the frequency of the incident wave. The wave with high frequency diffracts less than the wave with low frequency.

## Does diffraction change speed?

None of the properties of a wave are changed by diffraction. The wavelength, frequency, period and speed are the same before and after diffraction. The only change is the direction in which the wave is travelling.

• Microwaves.
• X-ray.