topic 5

Question 1

in figure 2, angle Y is the angle of

A) deflection
B) incidence
C) reflection
D) refraction

Answer 1

D) refraction

Question 2

student concludes that angle y is directly proportional to angle x

explain what the student must do to test this conclusion in more detail

Answer 2

repeat at different angles for longer angles

Question 3

match each description of waves to each wave in the em spectrum

Answer 3

1) infra red
2) microwave
3) radio wave
4) gamma wave

Question 4

when white light crosses the boundary between air and glass, it can split up into the colours of the spectrum.

explain in terms of speed why the light behaves like this

Answer 4

the colours have different wavelengths so travel at different speeds so refract by different amounts

Question 5

describe how the student could collect data to show how the rate of cooling of the container and water change with time

Answer 5

use a thermometer and measure temperature at regular intervals

Question 6

describe how the intensity of radiation varies with wavelength in figure 10

Answer 6

intensity reaches a peak value. most of the radiation is outside of the visible light spectrum

Question 7

explain why the temperature of the lamp rises and then remains at a constant value

Answer 7

temperature rises because energy supplied is greater than energy radiated. when it is constant the energy supplied is equal to energy radiated

Question 8

describe how a student could use the semicircular glass block and other apparatus to determine the critical angle an air glass boundary

Answer 8

shine a ray of light into the block through the curved surface along the radius. move the ray box until the angle of refraction is 90 degrees and then measure the angle of incidence