Answer:
K.E = 5.53 eV = 8.85 x 10⁻¹⁹ J
Explanation:
First we calculate the energy of photon:
E = hc/λ
where,
E = Energy of Photon = ?
h = Plank's Constant = 6.626 x 10⁻³⁴ J.s
c = speed of light = 3 x 10⁸ m/s
λ = wavelength = 120 nm = 1.2 x 10⁻⁷ m
Therefore,
E = (6.626 x 10⁻³⁴ J.s)(3 x 10⁸ m/s)/(1.2 x 10⁻⁷ m)
E = (16.565 x 10⁻¹⁹ J)(1 eV/1.6 x 10⁻¹⁹ J)
E = 10.35 eV
Now, from Einstein's Photoelectric equation we know that:
Energy of Photon = Work Function + K.E of Electron
10.35 eV = 4.82 eV + K.E
K.E = 10.35 eV - 4.82 eV
<u>K.E = 5.53 eV = 8.85 x 10⁻¹⁹ J</u>
The answer is a) geothermal energy. I may be wrong, sorry!
Answer:
m= 2[kg]
Explanation:
Linear momentum can be calculated as the product of mass by Velocity.
where:
P = linear momentum = 3 [kg*m/s]
v = velocity = 1.5 [m/s]
m = mass [kg]
![m=P/v\\m=3/1.5\\m=2[kg]](https://tex.z-dn.net/?f=m%3DP%2Fv%5C%5Cm%3D3%2F1.5%5C%5Cm%3D2%5Bkg%5D)
