Explanation:
Speed of the marathon runner, v = 9.51 mi/hr
Distance covered by the runner, d = 26.220 mile
Let t is the time taken by the marathon runner. We know that the speed of the runner is given by total distance divided by total time taken. Mathematically, it is given by :
t = 2.75 hours
Since, 1 hour = 60 minutes
t = 165 minutes
Since, 1 minute = 60 seconds
t = 9900 seconds
Hence, this is the required solution.
Answer;
A barrier, a surface or a boundary
Explanation;
Reflection is the property waves that occurs due to the bouncing back of a wave after it strikes a barrier.
Reflection involves change in direction of a wavefront at an interface between two different media such that the wavefront returns into the medium from which it originated. In other words, the direction of the wave changes when they bounce of a barrier or a surface.
I would say a because i just had this
Atoms are always neutral it means, the number of Protons & electrons are equal in them whereas ions are charged, the number is different depends on the kind of charge
Hope this helps!
Answer:
Explanation:
The enegy of a single photon is given by:
where
h is the Planck costant
c is the speed of light
is the wavelength of the photon
In this problem,
so the energy of one photon is
1 mole of photons contains a number of Avogadro of photons:
therefore, the total energy of 1 mole of these photons will be
