What does values of escape velocity indicate?

What is the value of escape velocity on a planet whose mass is 4 times and radius is half of earth? For earth escape velocity = 11.2 km s^-1 ?

For a certain chemical reaction, Variation in the concentration, In[R] vs time (min) plot is shown below: For this reaction : What does the slope of this line indicate?

What is escape velocity for the sun?

In the figure given below , the black line(upper) indicates action spectrum for photosynthesis and the lighter line (lower) indicates the absorption spectrum of chlorophyll 'a' , answer the followings: Wavelength of light nanometera(nm) What does the action spectrum indicate? how can we plot an action spectrum? explain with an example.

What does the smog indicate ?

Escape velocity on a planet is v_e , if the radius of the planet remains same and mass becomes four times, the escape velocity becomes

What does reciprocal of gold number indicate ?

What do you mean by +ve value of velocity or -ve value of velocity?