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slava [35]
3 years ago
10

Why? I need some help I would like at least 1 answer Thanks, Vishnu

Physics
1 answer:
siniylev [52]3 years ago
8 0
I think the 3rd one is the answer
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A beam of light, with a wavelength of 4170 Å, is shined on sodium, which has a work function (binding energy) of 4.41 × 10 –19 J
Lyrx [107]

Explanation:

Given that,

Wavelength of the light, \lambda=4170\ A=4170\times 10^{-10}\ m

Work function of sodium, W_o=4.41\times 10^{-19}\ J

The kinetic energy of the ejected electron in terms of work function is given by :

KE=h\dfrac{c}{\lambda}-W_o\\\\KE=6.63\times 10^{-34}\times \dfrac{3\times 10^8}{4170\times 10^{-10}}-4.41\times 10^{-19}\\\\KE=3.59\times 10^{-20}\ J

The formula of kinetic energy is given by :

KE=\dfrac{1}{2}mv^2\\\\v=\sqrt{\dfrac{2KE}{m}} \\\\v=\sqrt{\dfrac{2\times 3.59\times 10^{-20}}{9.1\times 10^{-31}}} \\\\v=2.8\times 10^5\ m/s

Hence, this is the required solution.

7 0
3 years ago
What is electromagnet and list the types of electromagnet.​
sineoko [7]

Answer:

radio waves, micro wave, x-rays

Explanation:

3 0
4 years ago
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How are strong nuclear forces and weak nuclear forces alike
Nesterboy [21]
Even tho one is stronger then the other... they are both alike because they are still nuclear forces.
6 0
3 years ago
What do you do when ur dog is running away?
Alexxx [7]

Answer:

Try to chase it or try to put up missing posters if you cant him/her, i never had a dog but i would do that and ask neighbors if they know where the dog is at.

Explanation:

7 0
3 years ago
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The input work done on a machine is 9.63 × 103 joules, and the output work is 3.0 × 103 joules. What is the percentage efficienc
notsponge [240]
Input work = 9.63×10³ J.
Output work = 3.0×10³ J

By definition,
Efficiency = (Output work)/(Input work)
                 = (3.0×10³)/(9.63×10³)
                 = 0.31 = 31%

Answer:  31%
5 0
3 years ago
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