When light of wavelength λ illuminates the surface of metal 1, the stopping voltage is v. in terms of v, what will be the stopping voltage if the same wavelength is used to illuminate the surface of metal 2? the work function of metal 1 is 3.6 ev and the work function of metal 2 is 2.1 ev. (a) v – 1.5 volts(b) 2.1 volts – v (c) 3.6 volts – v(d) v + 1.5 volts(e) 1.5 volts – v

(D) V + 1.5 volts

Explanation:

Eq. for stopping potential:

eV₀ = hf - ∅  eq (1)

where

V₀ = stopping potential

h = planks's constant

v = frequency of light

f = c/λ

∅ = work function

stopping potential for metal 1 =V₁= V

stopping potential for metal 1 = V₂

work function for metal 1 = 3.6 eVolts

work function for metal 2 = 2.1 eVolts

substituting values for metal 1 in eq (1)

eV₁ = hf - ∅₁

eV = hc/λ - 3.6 eVolts

V = hc/eλ - 3.6 Volts

hc/eλ =  V + 3.6 Volts   eq(2)

Metal 2 is illuminated with same wavelength so stopping potential V₂ is:

eV₂ = hf - ∅₂

eV₂ = hc/λ - 2.1 eVolts

V₂ =  hc/eλ - 2.1 Volts eq(3)

substituting eq(2) in eq(3)

V₂ =   V + 3.6 Volts - 2.1 Volts

V₂ =   V + 1.5 Volts

quantum mechanics or quantum physics is physics of very small objects (particles) and physical entities.

quantum physics has some parallels to our macro world and some pretty unique ideas which theoretically and mathematically proven to be true even though we will never be able to access them because of our size.

there are many types of particles: subatomic, elementary etc.

subatomic means they are smaller than atom, elementary means they are at the very basis of everything.

subatomic particles are for eg. protons, neutrons but not electrons.

elementary particles are categorised into 3 groups by what they do.

these 3 groups are quarks, leptons and bosons.

light for example is a particle more precisely a photon a part of leptons.

proton (subatomic particle) is made out of 2 up quarks and 1 down quark each of these has a fractional charge like . (i crazy)

most famous scientist who contributed to this physics are:

the topic itself us understand a lot and will probably be vastly used in the future (quantum computers, understanding the big bang,

we also must not forget quantum effects like:

and there is more. but probably too much for this answer to be consistent due to my average understanding of this topic.

hope this you understand quantum mechanics a little more. i'm not an expert in the topic (so don't be like wth if you are an expert) but i'm very interested in it.

anyways quantum physics is a very hard topic (harder than physics (perhaps)) therefore searching for every information there is about it and learning it is unfortunately impossible (you can only specialise into 1 - 3 things or more (perhaps

have fun and i wish you luck!

r3t40

elly's long hair:

a. if the salon only takes cash, then this isn't the problem. it doesn't matter how much she has in her checking account.   she can't get a haircut until she has the cash.

b. if she has overdraft protection, then there's no problem.   she can go ahead and write a check that her account can't cover, then sometime later, pay the bank some outrageous usury for loaning her a few bucks for a few days, but with beautiful hair.

c. if elly has some principles, and doesn't want to write a bad check, then now she has a problem.   her desire for the new hairstyle is in conflict with her honesty and integrity.

d.   if the bank will not process a check she writes, then even if she had a million $$ in her account, she couldn't use any of it.   the amount she has in her account is not the problem.   and if i may suggest, she might as well close her checking account, and put the money where it'll work for her.   it's not doing her a bit of good in a checking account, since she can't write any checks.

justin can't pay the full balance:

a. he can't even handle the credit limit he has now.   under no circumstances should he ask for a higher limit.

b.   he can ask for the grace period to be extended.   but that's no solution, the bank will almost certainly refuse anyway, and there are much better options.   he knew the rules of his credit card when he started using it.

c.   he definitely should pay the interest on the balance, plus as much of the balance as he can cover at the same time.

d.   he definitely should pay the minimum otherwise they could shut down his card.   he should also pay as much more as he possibly can.   he should also remember the awkward situation he's in, stop buying stuff on credit that he can't afford, and avoid adding any more debt.

i'd say that justin's best best option isn't on this list of choices.   what he has to do:   pay as much as he can at least the minimum payment plus as much more as he can and then avoid adding more debt.