Physics Paper 1

Question 1

Calculate wavelength

Answer 1

• Wavelength is two full curves up and down
• So you find length of one curve and double it
• 14x2 = 28cm

Question 2

Describe how the student could determine the frequency of the ripples on the lake.

Answer 2

• Count number of waves passing a point in a specific time
• Use frequency = number of waves/time

Question 3

What is one similarity and difference between isotopes

Answer 3

• Same number of protons
• Different number of neutrons

Question 4

State the SI unit for the activity of a radioactive source.

Answer 4

• Becquerel (Bq)

Question 5

what happens to the wave velocity and to the wavelength of the light when the light travels from air to glass?

Answer 5

• The wavelength and wave velocity both decreases

Question 6

Explain the decrease in intensity as the light travels from P to Q

Answer 6

• Some light is reflected at the top
• Some light is absorbed by the glass

Question 7

Which of these sketch graphs represents the speed of light as it travels from P to Q?

Answer 7

• Speed of light doesn’t change in the air
• The graph where it dips suddenly in a square then straight back up to how it was at first

Question 8

Which of these graphs represents an object moving with a constant velocity of 2 m/s

Answer 8

• Where displacement in m is in the y axis and it goes up in 2