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Your hand feels cold as an ice-block melts on it. Identify the correct explanation for this process. Heat has transferred from your hand to the ice-block by conduction Heat has transferred from the ice-block into your hand by radiation. Heat has transferred from your hand to the ice-block by radiation. Heat has transferred from the ice block into your hand by conduction. Sound is a longitudinal wave. This means that its particles: vibrate from side to side do not move at all vibrate back and forth move along with the wave An ultrasound pulse is reflected from a shark that is swimming 750 metres below the water surface. Given that the speed of sound in water is 1500 metres per second, the time delay between sending and receiving this pulse is: 0.5 seconds 3.5 hours 1 second 5 seconds The part of the ear that provide us with our sense of balance is the: semicircular canal semilunar hallway ear drum pinna The bending of light as it moves through a transparent material is called: diffraction reflection total internal reflection refraction The equation for the law of reflection is: i = r i = 2r2 r = i/2 i = r x N A translucent material: Allows some light to pass through and produces a fuzzy image. Allows almost all light to pass through and produces a clear image. Bends the light and produces an upside down image. Light entering a block of glass: reflects back along its original path bends at a 90 degree angle bends towards the normal bends awar from the normal When a ray of light enters water, it bends because: one side of the light ray hits the water and speeds up relative to other side. the light speeds when it hits the water one side of the light ray hits the water and slows down relative to the other side air is more dense than water A convex lens is a piece of glass or plastic used to bend light. It is: The same thickness all the way through thicker at each end and narrow in the middle narrow at each end and thick in the middle round like a ball Light entering a glass block bends because: The waves of light increase in amplitude as they enter the block. The block has lower density than air, causing the waves to slow down on one side and bend away from the normal. The block is higher density than air, causing the waves to slow down on one side and bend towards the normal. The air particles are sucked into the block. The frequency of a sound: All of the above. is measured in Hertz. is determined by how fast the source is vibrating. controls the pitch of the sound. Which of the following is true? A high pitched sound will have a shorter wavelength. A high pitched sound will have a longer wavelength. A quiet sound will have a longer wavelength than a loud sound. A loud sound will have a longer wavelength than a quiet sound. I have a teacup filled with water at 80 degrees Celsius and a 5L bucket filled with 60 degree water. Which of the following is FALSE? The water in the teacup has a higher temperature than the water in the bucket. The water in the bucket has more heat energy than the water in the teacup. The water molucules in the bucket are moving faster than the molecules in the teacup. Myopia is: NOT able to be treated with glasses. caused by the lens focusing light rays too far in front of the retina. caused by the lens focusing light rays behind the retina. Another word for long-sighted. In order of best insulators to worst insulators, the pool blankets are: A pool blanket is used to trap the heat within a pool to prevent heat loss overnight. Four types of pool blankets were tested on identical pools that were 28 degrees celsius when covered. The blankets were removed the next morning and the temperatures recorded. pool blanket Final temp Silverline, hot stuff, luxury, thermospecial silverline, luxury, hot stuff, thermospecial thermospecial, hot stuff, luxury, silverline Hot stuff 24 Silverline 26 Luxury liner 25.5 Thermospecial 23.5
Kai has been given a mystery liquid. In order to find out what it is, he conducted a refraction experiment and collected the following data. Kai's data Alcohol 10 20 30 i 14.9 22.1 r 7.5 The mystery substance is: Water reference table benzene material alcohol Benzene water refractive index 1.3174 1.3303 1.501 The colours of light in the visible spectrum in order from longest to shortest wavelengths are: Red, Orange, Yellow, Green, Blue, Indigo, Violet. Violet, Indigo, Blue, Green, Orange, Yellow, Red. Red, Yellow, Pink, Green, purple, orange and Blue. Violet, blue, indigo, green, red, orange, yellow. Jo wanted to shine a YELLOW light onto a stage, but he only has primary coloured lights. Which lights should he use to make yellow? Green and blue Red and Green Red and Blue Red and Green and Blue A leaf appears green to our eyes because: The pigments in the leaf reflect light in the greenwavelengths and absorb all other visible wavelengths. Leaves are green. Dah! The pigments in the leaf absorb light in the green wavelengths and reflect all other visible wavelengths. The pigments in the leaf reflect light in the green and red wavelengths and absorb the blue. |