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
andriy [413]
3 years ago
10

A xenon arc lamp is covered with an interference filter that only transmits light of 400-nm wavelength. When the transmitted lig

ht strikes a metal surface, a stream of electrons emerges from the metal. The interference filter is then replaced with one transmitting at 300 nm and the lamp adjusted so that the intensity of the light striking the surface is the same as it was for the 400-nm light. With the 300- nm light 1. more electrons are emitted in a given time interval. 2. the electrons which are emitted are more energetic 3. both are true. 4. both are false. Please choose from 1-4, explaining your answer.
Physics
2 answers:
zepelin [54]3 years ago
4 0

Answer:

3. both are true.

Explanation:

Energy increses with decrease in wavelenght.

For photoemission to occur, a threshold energy barrier must be broken.

Higher energy means more electrons will be emmited.

The electrons emmited will posses energy that is less than the incident energy by the value of the threshold energy.

So the higher the energy, the higher the energy possessed by the electrons.

Anna35 [415]3 years ago
4 0

Answer:

3. Both are true

Explanation:

This is because the number of electrons emitted and their energy does not depend on intensity but on the wavelength. From K.E = hc/λ - Φ where λ = wavelength, Φ = work function and hc/λ = energy of the incoming light

Electrons are emitted when hc/λ > Φ. Since the energy of the incoming light is inversely proportional to its wavelength, for the 300 nm light, there is more energy and thus the difference hc/λ - Φ is more than that of the 400 nm light thereby releasing more electrons.

Also, since the difference hc/λ - Φ is more than that of the 400 nm light the kinetic energy K.E of the electrons is also more in this instant. So the electrons emitted are more energetic.

You might be interested in
If we put a convex lens made by crown glass <br>in Carbondia sulphide what will happen?​
7nadin3 [17]

Answer:

I don't knowI think it will break

4 0
3 years ago
Two identical cars, one on the moon and one on the earth, have the same speed and are rounding banked turns that have the same r
Naily [24]

Answer:

The value of the centripetal forces are same.

Explanation:

Given:

The masses of the cars are same. The radii of the banked paths are same. The weight of an object on the moon is about one sixth of its weight on earth.

The expression for centripetal force is given by,

F_{c} = \dfrac{mv^{2}}{r}

where, m is the mass of the object, v is the velocity of the object and r is the radius of the path.

The value of the centripetal force depends on the mass of the object, not on its weight.

As both on moon and earth the velocity of the cars and the radii of the paths are same, so the centripetal forces are the same.

3 0
3 years ago
A car travelling at 5.0 m/s starts to speed up. After 3.0 s its velocity has increased to 11 m/s. a) What is its acceleration? (
lions [1.4K]

initially, the car is traveling at 5.0 m/s.

so, we know acceleration for changing velocity is :

a = (v-v_{o})/t ..........(i)

where v is the final velocity

v_{o} is the initial velocity

t is the time taken to change velocity

Now, as per the question :

initial velocity, v_{o}=5.0 m/s

final velocity, v =11 m/s

time taken, t = 3 s

putting the values in equation (i),

a = ( 11-5 )/3

a = 2 m/s²

Therefore, a, after 3 s, is  <em>2 m/s².</em>

4 0
1 year ago
How many atoms of oxygen in the chemical formula 2 Ca(CIO2)2?<br> O 2<br> O 4<br> O 6<br> O 8
alexdok [17]

Answer:

I believe it's 8

Explanation:

3 0
2 years ago
Find expressions for the force needed to bring an object of mass m from rest to speed v in time t. express your answer in terms
VARVARA [1.3K]
Good morning.

We have that:

\mathsf{V = a\cdot t} , since we have rest in the inicial time.

The acceleration can be found with Newton's Law:

\mathsf{F = m\cdot a\iff a = \dfrac{F}{m}}

Now we put the acceleratin in the velocity equation:

\mathsf{V = \dfrac{F}{m} \cdot t}

We want the force, so, let's isolate F:

\mathsf{V\cdot m = F\cdot t}\\ \\ \\ \boxed{\mathsf{F = \dfrac{V\cdot m}{t}}}

3 0
3 years ago
Other questions:
  • A truck accelerates from a stop to 27m/sec in 9 minutes. What was the trucks acceleration?
    12·1 answer
  • Which of the following is not used to measure wind?
    13·2 answers
  • What type of device uses an electromagnet to convert electrical energy into mechanical energy?
    11·2 answers
  • A teacher wants to demonstrate that unheated water can boil at room temperature in a beaker within a bell jar connected to a vac
    15·1 answer
  • How can i calculate tangential acceleration
    7·1 answer
  • Like magnetism, static electricity can attract and repel.<br> True<br> False
    10·2 answers
  • How does jet stream form
    7·1 answer
  • I need to show my work as well but on the computer so, please show work for how you got the answers. Thank you!
    12·1 answer
  • What is the difference in graph shape when it is postion vs.time vs. velocity vs. time graph. Using a motion detector.
    6·1 answer
  • CAN SOMEONE PLZ HELP
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!