waves (5054) part 3

Which waves are longitudinal?

• A gamma rays

• B light waves

• C ultrasound waves

• D X-rays

A parallel beam of light is incident on a thin diverging lens. The focal length of the lens is FL, as shown in the diagram.

Which ray diagram shows the beam after it has passed through the lens?

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The following lists show colours of the spectrum. Which list shows these colours in order of increasing frequency?

• A blue, violet, red, orange, yellow, green

• B green, blue, violet, red, orange, yellow

• C red, orange, violet, yellow, green, blue

• D red, orange, yellow, green, blue, violet

Four sound waves are displayed on the screen of a cathode-ray oscilloscope. Which sound wave gets louder and has a pitch that decreases?

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A swimming pool is lit by an underwater light. A ray of light is incident on the water surface. What is the correct path for the ray of light?

• a

• b

• c

• d

What is a feature of red light compared with that of violet light?

• A A prism deviates red light more.

• B Red light has a lower frequency.

• C Red light has a shorter wavelength.

• D The speed of red light in a vacuum is smaller.

Ultrasound is used to clean jewellery in a liquid. What is another use of ultrasound?

• A optical fibre communication

• B pre-natal scanning

• C sunbeds

• D telephone communications

What is the ratio of the longest sound wavelength audible to a healthy human ear to the shortest?

• A 20 : 1

• B 1000 : 1

• C 10 000 :1

• D 20 000 :1

The displacement-distance and displacement-time graphs are for a water wave in a ripple tank.

What is the speed of the water wave?

• A 0.02cm/ s

• B 0.08cm/ s

• C 25cm/ s

• D 50cm/ s

A wave of frequency 13 000Hz travels 1300m in 4.0s. What is the wavelength of the wave?

• A 0.025m

• B 0.40m

• C 2.5 m

• D 40 m