U1-1-1 - Electromagnetic Spectrum

Question 1

Symbol for wavelength

Answer 1

λ (lambda)

Question 2

How do you convert wavelength from metres (m) to nanometres (nm)?

Answer 2

wavelength × 10⁹

Question 3

How do you convert wavelength from nanometres (nm) to metres (m)?

Answer 3

wavelength × 10⁻⁹

Question 4

All electromagnetic waves travel at the same velocity in a vacuum − _____________________.

Answer 4

the speed of light (c).

3 × 10⁸ m s⁻¹

Question 5

Arrange in order of increasing energy:

ultraviolet

infrared

visible

Answer 5

infrared, visible, ultraviolet

Question 6

Arrange in order of increasing wavelength:

ultraviolet

infrared

visible

Answer 6

ultraviolet, visible, infrared

Question 7

How many significant figures should an answer have?

Answer 7

One less or up to two more than expected

Expected = same as the number which has the lowest no. of sig. fig.

If in doubt, use 3 sig. fig.

Question 8

Multiple numbers are given in a question:

0.36
0.1
1.2

Which one determines the no. of significant figures in the answer?

Answer 8

0.1 (lowest no. of sig. fig.)