CIE Physics Paper-1: Specimen Questions 71 - 73 of 109
Question number: 71
A man tunes his radio from 10 to 60. What does the 60 explain?
Here man turns his radio from 10 to 60.
Unit of frequency is Hz or 1/s, unit of speed is and unit of wavelength is meter.
Only amplitude is unit less. So man turns amplitude of radio
Question number: 72
Explain graph between potential difference and current, known that potential difference changes with changes in current through the wire.
From Ohm’s Law graph of current vs potential difference is always straight line passing throw origin.
If p. d is zero, current will also zero.
Question number: 73
Find the amount of sample left after 20 hours if the half-life is 5 hours and has 0.48g of the substance.
Here from given data
Formula of half-life is given as,