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OLga [1]
2 years ago
14

PLEASE HELP ME WITH THIS ONE QUESTION

Physics
1 answer:
melamori03 [73]2 years ago
3 0

Explanation:

First, we convert the energy from eV to Joules:

2.90\:\text{eV}×\left(\dfrac{1.6×10{-19}\:J}{1\:\text{eV}} \right)

= 4.64×10^{-19}\:\text{eV}

We know from definition that

E=h\nu = \dfrac{hc}{\lambda}

so the wavelength of the photon is

\lambda = \dfrac{hc}{E} = 4.28×10^8\:\text{m}

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dexar [7]

Answer:

The frictional force between two bodies depends mainly on three factors: (I) the adhesion between body surfaces (ii) roughness of the surface (iii) deformation of bodies

7 0
2 years ago
Starting from rest, a 2.1x10-4 kg flea springs straight upward. While the flea is pushing off from the ground, the ground exerts
nirvana33 [79]

Answer:

1.327363 m/s

0.00090243 m

Explanation:

u = Initial velocity

v = Final velocity

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Energy

E=\frac{1}{2}m(v^2-u^2)\\\Rightarrow 3.7\times 10^{-4}=2.1\times 10^{-4}(v^2-0)\\\Rightarrow v=\sqrt{\frac{3.7\times 10^{-4}}{2.1\times 10^{-4}}}\\\Rightarrow v=1.32736\ m/s

The velocity of the flea when leaving the ground is 1.327363 m/s

W=F\times s\\\Rightarrow s=\frac{W}{F}\\\Rightarrow s=\frac{3.7\times 10^{-4}}{0.41}\\\Rightarrow s=0.00090243\ m

The flea will travel 0.00090243 m upward

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3 years ago
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3 0
3 years ago
Read 2 more answers
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