1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Nataly_w [17]
3 years ago
7

If the stopping potential of a metal when illuminated with a radiation of wavelength 480 nm is 1.2 V, find (a) the work function

of the metal, (b) the cutoff wavelength of the metal, and (c) the maximum energy of the ejected electrons
Physics
1 answer:
Sindrei [870]3 years ago
6 0

Answer:

a) \phi=2.22\times10^{-19}\, J

b) \lambda_0=900 \, nm

c) K_{max}=e\cdot V_0=1.922\times 10^{-19}\, J

Explanation:

a)  

We have that for the photoelectric effect the maximum kinetic energy for the electrons is given by:

K_{max}=\frac{hc}{\lambda}-\phi=e\cdot V_0

From the previous we get:

\phi=\frac{hc}{\lambda}-e\cdotV_0\=2.22\times10^{-19} \, J

Where we used the fact that h=6.63\times 10^{-34} \, J.s,e=1.602\times 10^{-19} \, C and c=3\times 10^{8}\, m/s.

b)

The work function is defined as:

\phi=\frac{hc}{\lambda_{0}}\implies\lambda_0=\frac{hc}{\phi}=9.0\times10^{-7}=900 \, nm

Where \lambda_0 is the cutoff wavelength.

c)

As said before:

K_{max}=e\cdotV_0=1.602\times 10^{-19}=1.922\times 10^{-19} J

You might be interested in
A permanent magnet is pushed into a wire, left there for a while, and then pulled out. During which time does a current run thou
lakkis [162]

Answer:

C. while the magnet is moving

Explanation:

Electromagnetic induction implies the production of electric current by mere movement of a magnet with respect to a coil or wire.

In the given question, current would be induced in the wire only when the magnet moves. That is either when the magnet is pushed into a wire, or when pulled out. But no current would flow through the wire when the magnet is left there for a while.

The current is induced because of the motion involved. Thus, the appropriate option is C.

8 0
3 years ago
a water-balloon launcher with mass 4 kg fires a 0.5 kg balloon with a velocity of 3 m/s to the east. what is the recoil velocity
kotykmax [81]
I think we will use the law of conservation of linear momentum;
M1V1 = M2V2
M1 =  4 kg (mass of the water balloon launcher)
V1=?
M2= 0.5 kg ( mass of the balloon)
V2 = 3 m/s

Therefore; 4 V1 = 0.5 × 3
                   4V1= 1.5
                     V1= 1.5/4
                          = 0.375 m/s










5 0
3 years ago
Read 2 more answers
You have to run 2.2 miles in track. How far is this in feet? Note: There are
Romashka [77]

Answer: B

Explanation: This can be easily done by inputting 5280 * 2.2.

3 0
3 years ago
Read 2 more answers
Explain electric circuits. Be sure to include the features, the roles, and the types. Help PLEASEEEE!!
maksim [4K]
If there was any way to do that, then your teacher wouldn't
need to keep you coming into class every day and doing
homework every night.  She could just give you the 3 or 4
paragraphs and a few pictures that you're asking me for,
and bada-bing ! you'd know it !

The time it takes, and the amount of homework it takes, is
EXACTLY the time you spent hearing about it in class.

(Unless you're some kind of genius savant prodigy, which
you're not and I'm not.)
5 0
3 years ago
How to represent milligram in kilogram by standard formula?
Anettt [7]

Answer:

0.000001 kg

Explanation:

because 1 kg equal 1,000,000 milligrams

we take   \frac{1}{1,000,000} which equals 0.000001 kg

4 0
3 years ago
Other questions:
  • Two conducting parallel plates 5.0 × 10−3 meter apart are charged with a 12-volt potential
    9·1 answer
  • List 3 examples in which friction helps us or makes things easier in our daily life. Explain the effect of friction for each.
    14·2 answers
  • An _____ contains in maximum number of hydrogen atoms possible
    10·1 answer
  • A person whose mass is m = 70.0 kg m=70.0 kg steps on a mechanical bathroom scale placed on an inclined plane that makes the ang
    8·1 answer
  • Until a train is a safe distance from the station, it must travel at 5 m/s. Once ti
    15·1 answer
  • What does amplitude mean
    10·1 answer
  • You have to heat up a 1.000 gram ingot of aluminum from initial temperature Ti = 847 K to its melting point, 933 K. Calculate th
    9·1 answer
  • At an amusement park, a swimmer uses a water slide to enter the main pool. a. If the swimmer starts at rest, slides with negligi
    8·1 answer
  • You are kicking your soccer ball back and forth on a soccer field. You kick the ball forward for 10 m. You turn completely aroun
    14·1 answer
  • Astronauts need sophisticated spacesuits to protect them from the harsh conditions of space. These spacesuits are very heavy for
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!