Waves, sound & optics worksheet with answers

Free printable Waves, sound & optics worksheet: 6 problems from easy to exam level, with an answer key. Print it or save it as a PDF.

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Name: ____________________   Date: ____________

1.Easy
v = ?

Find the speed v of light in water, which has a refractive index of 1.33.

n = 1.33c = 3.00 × 10⁸ m/s
v = m/s
2.Easy
PI = 1 × 10⁻⁵ W/m²

The sound intensity near a vacuum cleaner is 1 × 10⁻⁵ W/m². Find the sound intensity level β in decibels.

I = 1 × 10⁻⁵ W/m²I0 = 10⁻¹² W/m²
β = dB
3.Medium
FFdo​ = 8 cmf = 20 cm

An object stands 8 cm in front of a thin converging lens with a focal length of 20 cm. Find the magnification m (negative for an inverted image).

do = 8 cmf = 20 cm
m =
4.Medium
FFdo​ = 8 cmf = 15 cm

An object stands 8 cm in front of a thin converging lens with a focal length of 15 cm. Find the magnification m (negative for an inverted image).

do = 8 cmf = 15 cm
m =
5.Hard
Fdo​ = 15 cmR = 24 cm

An object is 15 cm in front of a concave mirror with a radius of curvature of 24 cm. Find the magnification m (negative for an inverted image).

do = 15 cmR = 24 cm
m =
6.Hard
Fdo​ = 10 cmR = 20 cm

An object is 10 cm in front of a convex mirror with a radius of curvature of 20 cm. Find the magnification m (negative for an inverted image).

do = 10 cmR = 20 cm
m =

Answer key

  1. 1. v = 2.256 × 10⁸ m/s
  2. 2. β = 70 dB
  3. 3. m = 1.667
  4. 4. m = 2.143
  5. 5. m = −4
  6. 6. m = 0.5

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