Wavelength is the
ratio of speed of light and frequency:
wavelength = speed of
light / frequency
where frequency is: (c
is speed of light)<span>
freq = c / wavelength = 3E8/550E-9 = 5.45E14 Hz
We know that photons have energy E = hf = 6.626E-34 Js * 5.45E14
Hz = 3.61 E-19 J
Therefore if it has 4.40 mJ of energy, the pulse has:
<span>4.40E-3/3.61E-19 = 1.22E16 photons</span></span>
Hey There!
You should choose 1-10 uL pipette !
Small range measurement scales are more efficient than large range scale because they give more accurate measurement as they have visible marks on it small for all measurement.
Answer:
d) additional heat alters the vicosity and the surface tension of the liquid which raises the vapor pressure and increases the boiling point which is why you must continually heat the solution
Answer:
That unknown substance is water
Explanation:
Correct Answer: Option g: <span>adding salt to water lowers its freezing point
Reason:
Freezing point is a colligative property. When a non-volatile solution is present in solution, it's freezing point decreases. This is referred as depression in freezing point (</span>ΔTf<span>). Extent of lowering in freezing point is dependent on number of particles present in system. Mathematically it is expressed as:
</span>ΔTf = Kf X m
<span>
where, m = molality of solution
Kf = cryoscopic constant.
Hence, a</span><span>dding salt to water lowers the freezing point of solution.</span>
