Waves_Physics

The diagrams show water waves in three different situations. The arrows show the direction of travel
of the waves. Which row shows what is shown in each diagram?

• diffraction
  - reflection
  - refraction

• reflection
  - refraction
  - diffraction

• diffraction
  - refraction
  - reflection

• reflection
  - diffraction
  - refraction.

Sound travels through air as a series of compressions and rarefactions. Which statement correctly compares a compression with a rarefaction?

• In a compression the wavelength is longer than in a rarefaction.

• In a compression the wavelength is shorter than in a rarefaction.

• In a compression the density of the air is greater than in a rarefaction.

• In a compression the density of the air is lower
  than in a rarefaction.
  

The diagram shows a beam of light travelling through glass and meeting a glass-air interface. Which row on the table correctly describes what is happening at the glass-air interface?

• angle of incidence
  at the interface = 30⁰, some internal reflection.

• angle of incidence
  at the interface = 60⁰, total internal reflection.

• angle of incidence
  at the interface = 60⁰, some internal reflection.

• angle of incidence
  at the interface = 30⁰, total internal reflection.

The incomplete ray diagram shows two rays of light that have passed from one point on an object through a thin converging lens. Which row on the table shows the type of image and the side of the lens on which it is formed?

• real - on the left.

• real - on the right.

• virtual - on the left.

• virtual - on the right.

What causes the change in direction when light travels from air into glass?

• The amplitude of the light changes.

• The colour of the light changes.

• The frequency of the light changes.

• The speed of the light changes.

A beam of white light is split into a spectrum of seven colours. Which name is given to this process?

• diffraction.

• dispersion.

• reflection.

• refraction.

The frequency of the microwaves used in a microwave oven is 2400 MHz.

What is the wavelength of these microwaves?

• 0.125 m.

• 8.00 m.

• 125 m.

• 7200 m.

Where do all types of electromagnetic waves travel at the same speed?

• air

  
  

• a vacuum

• glass

• water

Which statement about converging lenses is correct?

• A real image of an object projected onto a screen by a converging lens is always inverted.

• The image formed by a converging lens is always upright.

• The image formed by a converging lens when used as a magnifying glass is a real image.

• Parallel rays entering a converging lens are focused at a distance greater than the focal lengthfrom the lens.

The diagram shows a wave.

• amplitude: 1cm; wavelength: 8cm.

• amplitude: 1cm; wavelength: 4cm.

• amplitude: 2cm; wavelength: 8cm.

• amplitude: 2cm; wavelength: 4cm.