CIE Physics Paper-1: Specimen Questions 86 - 88 of 109
Question number: 86
Find the amount of sample left after 18 hours if the half-life is 8 hours and has 0.37 g of the substance.
Here from given data
Formula of half-life is given as,
Question number: 87
The diagram shows a speed-time graph for a body moving with constant acceleration. What is the shaded area under the graph?
Here in above figure the graph of speed vs time is given.
Then area under the graph denoted speed ⨯ time.
As we know that speed means velocity
Then in this graph area under the graph is distance.
Question number: 88
What leads to refraction when light travels from air to glass?
The color of the light changes.
The frequency of the light waves changes.
The speed of the light changes.
The amplitude of the light waves changes.
The process in which light pass through one medium to another medium is known reflection. Here light travels from air to glass. So light travels from rarer medium to denser medium therefore there is change in refracting medium. And because of it the speed of light will changes.