Answer:
<em>The energy of an individual photon that comes out of the laser pointer is 1.91 eV</em>
Explanation:
The energy of a photon can be obtained using the expression below
E = hc/λ
where E is the energy;
h is the Planck's constant = 6.626 x 10-34 Js;
c is the speed of light = 3.00 x m/s (speed of light);
λ is the wavelength = 650 nm =650 x m.
E = (6.626 x 10-34 Js) x (3.00 x m/s) /650 x m
E = 3.058 x J
1 joule = 6.242 x eV
3.058 x J = 3.058 x J x 6.242 x eV = 1.91 eV
Therefore the energy of an individual photon that comes out of the laser pointer is 1.91 eV
The formula for momentum is p = m*v
The conservation of momentum suggests:
m*vi = m*vf (initial mass times initial velocity = final mass times final velocity or initial momentum = final momentum)
(0.0010)(52.2) = (0.0010 + 3.3)vf
vf = (0.0010)(52.2)/(0.0010 + 3.3) = 0.0522/3.301 ≈ 0.01581 m/s
To the nearest thousandth ≈ .016 m/s
Answer:
Explanation:
mass of the crate = 5 kg
Force on crate = 0.22 N
now the speed of the crate after t = 10 s
Now the time taken by the crate to reach the orchestra pit
now we know that
Answer: [B]: "power is the rate at which work is done" .
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V = IR
Where:
V = Voltage
I = Current
R = Resistance