# 9-1 Topic 5 Electromagnetic Spectrum 1

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### The intensity and wavelength of the emitted radiation vary with the temperature of the object. The picture shows this variation for an object at two different temperatures. The visible region of the electromagnetic spectrum is also shown. In which part of the electromagnetic spectrum is the peak of the low temperature curve? • gamma
• infra red
• ultra violet

### What do all waves in the electromagnetic spectrum have in common?

• the same frequency in a vacuum
• the same speed in a vacuum
• the same colour in a vacuum
• the same amplitude in a vacuum

### The lens shown in the diagram has a focal length of 12.0 cm. This lens can produce • only inverted images
• only real images
• only virtual images
• both real and virtual images

### The lens shown in the diagram has a focal length of 12.0 cm. The power of this lens is: • 8.3 dioptre
• 0.83 dioptre
• 0.083 dioptre
• 0.0083 dioptre

### Lenses are used in spectacles to treat some vision defects. The two main lens types are converging lenses and diverging lenses. Diverging lenses always produce virtual, diminished images. Which row of the table describes the images produced by a converging lens? • A
• B
• C
• D

• decibel
• dioptre
• metre
• watt

### Which of these describes the image formed by this converging lens when it is used as a magnifying glass?

• inverted, real
• right way up, real
• inverted, virtual
• right way up, virtual

### The diagrams show rays of light passing through two lenses labelled M and N. The light changes direction as it leaves the lenses. This is called: • contraction
• diffraction
• deflection
• refraction

### The diagram shows an eye of a short sighted person. A diverging lens is used to correct short sight. The eye will form an image of a distant object. Which letter shows where the image will form for the short sighted eye? • A
• B
• C
• D

### The diagram shows the possible paths for a ray of light which strikes a surface at the point O. Which of the lines show the possible path of a ray of light passing from air into glass? • POS
• POR
• ROP
• ROS