Which value is the standard approximation for the speed of light in a vacuum, c?

A radio pulse, visible-light pulse, and x-ray pulse cross the same vacuum path. Take $c=3.00\times 10^8$ m/s. In what order do they arrive?

A red laser beam passes from a vacuum into a glass block. Which property of the light stays the same in the glass?

A bright green laser pulse and a dim microwave pulse move through a vacuum. Take $c=3.00\times 10^8$ m/s. Which statement is correct?

The Moon is $3.84\times 10^8$ m from Earth. Take $c=3.00\times 10^8$ m/s. How long does light take to travel that distance?

A satellite is $3.60\times 10^7$ m from a ground antenna. Take $c=3.00\times 10^8$ m/s. What is the one-way signal time in a vacuum?

A radio signal travels $7.80\times 10^{10}$ m from Earth to Mars through space. Take $c=3.00\times 10^8$ m/s. What is the travel time?

Proxima Centauri is 4.24 light-years away, and $1\text{light-year}=9.46\times 10^{15}\text{m}$. Take $c=3.00\times 10^8$ m/s. What is the light travel time?

In a lab, a laser pulse crosses a 15.0 m vacuum tube. Take $c=3.00\times 10^8$ m/s. How long does the trip take?

A light pulse travels 2.40 km in a vacuum. Since $1\text{km}=10^3\text{m}$, use $d=2.40\times 10^3$ m and $c=3.00\times 10^8$ m/s. What is the time?

A deep-space probe is $1.20\times 10^{12}$ m away. Take $c=3.00\times 10^8$ m/s. How long does a one-way radio command take to reach it?

A signal crosses $6.00\times 10^5$ km of empty space. Use $1\text{km}=10^3\text{m}$ and $c=3.00\times 10^8$ m/s. What is the travel time?

A light pulse travels for $2.50\times 10^{-6}$ s in a vacuum. Take $c=3.00\times 10^8$ m/s. How far does it travel?

A radio flash travels through a vacuum for 0.0400 s. Take $c=3.00\times 10^8$ m/s. What distance does it cover?

A microwave signal has frequency $2.45\times 10^9$ Hz in a vacuum. Take $c=3.00\times 10^8$ m/s. What is its wavelength?

An ultraviolet wave has frequency $1.00\times 10^{15}$ Hz in a vacuum. Take $c=3.00\times 10^8$ m/s. What is its wavelength?

A long-wave radio signal has frequency $2.00\times 10^5$ Hz in a vacuum. Take $c=3.00\times 10^8$ m/s. What is its wavelength?

Light travels at $2.00\times 10^8$ m/s in a glass block. Take $c=3.00\times 10^8$ m/s. What is the index of refraction of the glass?

A transparent plastic has index of refraction n = 1.25. Take $c=3.00\times 10^8$ m/s. What is the speed of light in the plastic?

In material A, light travels at $2.50\times 10^8$ m/s; in material B, it travels at $1.50\times 10^8$ m/s. Take $c=3.00\times 10^8$ m/s. Which statement is true?