U1-1-1 - Electromagnetic Spectrum Flashcards

1
Q

Symbol for wavelength

A

λ (lambda)

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2
Q

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

A

wavelength × 109

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3
Q

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

A

wavelength × 10−9

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4
Q

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

A

the speed of light (c).

3 × 108 m s−1

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5
Q

Arrange in order of increasing energy:

ultraviolet

infrared

visible

A

infrared, visible, ultraviolet

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6
Q

Arrange in order of increasing wavelength:

ultraviolet

infrared

visible

A

ultraviolet, visible, infrared

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7
Q

How many significant figures should an answer have?

A

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.

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8
Q

Multiple numbers are given in a question:

0.36
0.1
1.2

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

A

0.1 (lowest no. of sig. fig.)

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