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Question 19M.1.HL.TZ2.11

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.1.HL.TZ2.11
Level HL Paper 1 Time zone TZ2
Command term Question number 11 Adapted from N/A
11.
[Maximum mark: 1]
19M.1.HL.TZ2.11

The escape speed from a planet of radius R is vesc. A satellite orbits the planet at a distance R from the surface of the planet. What is the orbital speed of the satellite?

A.  1 2 v esc

B.  2 2 v esc

C.  2 v esc

D.  2 v esc

[1]

Markscheme

A

Examiners report

This had a very low discrimination index with the majority of candidates choosing B, followed by C. Response A, the correct answer, was third in popularity. The candidates missed that the satellite orbits at a distance of R from the surface of a planet of radius R so the total distance to be considered was 2R.

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