Use the equation, F= m(mass)x a (acceleration) to find the net force.
Answer:
(a). The first wavelength is 401.0 nm.
(b). The metal's work function is 2.55 eV.
Explanation:
Given that,
Maximum kinetic energy = 0.65 eV
Second wavelength
(a). We need to calculate the wavelength
Using equation of work function for first wavelength
.....(I)
For second wavelength,
Put the value of second wavelength
....(II)
By subtraction equation (I) from (II)
(b). We need to calculate the work function
Using formula of work function
Put the value into the formula
Hence, (a). The first wavelength is 401.0 nm.
(b). The metal's work function is 2.55 eV.
Number of protons = atomic number (12)
Mass Number = 0.25
mass number = number of protons + number of neutrons
Number of neutrons = mass number - number of protons
Number of neutrons = 0.25 - 12
number of neutrons = - 11.75
(i) The density of the solid is 950 kg/m³
(ii) the density of another liquid in which the same solid would float is 200 kg/m³
The given parameters;
mass of the solid in air, Ma = 237.5 g
mass of the solid in liquid, Ms = 12.5 g
density of the liquid,
(i) The density of the solid is calculated as follows;
Weight in air - Weight in liquid = upthrust
(ii) the density of another liquid in which the same solid would float with one-fifth of its volume exposed above the liquid surface.
This is a low density liquid, because one-fifth of the solid is above the liquid surface while four-fifth is below the liquid surface.
the specific gravity of the liquid = ¹/₅ = 0.2
density of water ,
Thus, the density of another liquid in which the same solid would float is 200 kg/m³
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