Skip to content
free
K
1
2
practice
Home
Math
English
Science
Social Studies
Contact
Language
English
Español
Sign In
/
High School Electives
/
Astronomy
/
Wave Speed, Frequency, and Wavelength
Grade Level
Astronomy
AST.063 Wave Speed, Frequency, and Wavelength
0%
Skill Level
🟡 Medium
00:00
Progress to Next Level
25% to Medium
Easy
Medium
Hard
Mastery
100%
An astronomy data file lists one wave measurement. For near-infrared starlight, use c = 3.00 × 10
8
m/s and f = 2.00 × 10
14
Hz. Which calculator entry correctly finds λ?
A
Invert the ratio: λ = f/c = (2.00 × 10
14
Hz)/(3.00 × 10
8
) = 6.67 × 10
11
μm.
B
Divide by f twice: λ = c/f
2
= (3.00 × 10
8
)/(2.00 × 10
14
Hz)
2
= 7.50 × 10^-15 μm (in this context).
C
Convert f to 2.00 × 10
14
Hz, then λ = c/f = (3.00 × 10
8
m/s)/(2.00 × 10
14
Hz) = 1.50 μm.
D
Multiply instead of divide: λ = cf = (3.00 × 10
8
)(2.00 × 10
14
Hz) = 6.00 × 10
28
μm.
Submit Answer
