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Which waves are longitudinal?
A gamma rays
B light waves
C ultrasound waves
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?
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?
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?
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
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?
C 2.5 m
D 40 m
A shoe shop puts a mirror on the wall so that customers can look at their shoes. The length of the mirror is 50cm. A customer has eyes 150cm above ground level.
The bottom of the mirror is at height h above the ground. What is the smallest value of h that allows the customer to see an image of his shoes in the mirror?