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
Firlakuza [10]
3 years ago
5

Light of frequency 2.5 x 1015 Hz illuminates a

Physics
1 answer:
Nikitich [7]3 years ago
3 0

Answer:

h f = W + KE

Input energy equals work function plus KE of emitted electron

W = 6.63E-34 * 2.5E15 - 6.3 * 1.6E-19

W = 6.63 * 2.5 * 10^-19 - 10.1 * E-19 ev     (1ev = 1.6E-19 J)

W = (16.6 - 10.1)E-19 = 6.5E-19 J

h f = 6.5E-19 J        for electrons to be emitted with zero KE

f = 6.5E-19 / 6.63E-34 = .98E-15 / sec = 9.8E-14 / sec  (threshold)

You might be interested in
Two concentric current loops lie in the same plane. The outer loop has twice the diameter of the inner loop. The inner loop carr
Flauer [41]

Answer: The outer loop should carry a current of 2.0 A.

The current should flow in the counter-clockwise direction

Explanation: Please see the attachments below

7 0
3 years ago
Describe how the life cycle of a low-mass star differs from the life cycle of a high-mass star. PLZZZZ ANSWER FAST
Alex Ar [27]
 <span>As the core collapses, the </span>outer<span> layers of the star are expelled. A planetary nebula is formed by the </span>outer <span>layers. The core remains as a white dwarf and eventually cools to become a black dwarf. that is what would happen to a star with a low mass like our sun also the life time of a star depends on it's mass. A larger mass star will colapse and turn into a black hole.</span><span>
</span>
8 0
3 years ago
Calculate the pressure in SI unit when a force of 100 dyne acts on area of 0.02cm²​
Andru [333]

Answer:

500 Pa

Explanation:

Convert given units to SI:

100 dyne = 0.001 N

0.02 cm² = 2×10⁻⁶ m²

Pressure = force / area

P = 0.001 N / (2×10⁻⁶ m²)

P = 500 Pa

7 0
4 years ago
The students changed the release distance of the sphere during their investigation. Which statements best describe the purpose f
vodka [1.7K]

Since unbalanced forces acts on the spheres, the aim of increasing the release distance of the spheres is to observe the effect of unbalanced forces acting on the spheres.

<h3>What is an experiment?</h3>

An experiment is a study whose objective is to study cause and effect relationships. In this case, the students had to increase the distance at which the spheres was released.

The aim of increasing the release distance of the spheres is to observe the effect of unbalanced forces acting on the spheres.

Learn more about experiments: brainly.com/question/11256472

4 0
2 years ago
A baseball with a mass of 0.8 kg is given an acceleration of 20m/s.how much force was applied to the ball
Delicious77 [7]
F=mass x acceleration = ma= 0.8*20 = 16N
5 0
3 years ago
Other questions:
  • You are 12 miles north of your base camp when you begin walking north at a speed of 2mph. what is your location, relative to you
    15·1 answer
  • Eat the majority of your calories in the evening to fuel your sleep hou<br> True<br> False
    7·2 answers
  • An electron moves in a straight path with a velocity of +500,000 m/s. It undergoes constant acceleration of +500,000,000,000 met
    13·1 answer
  • According to ____________, energy cannot be created or destroyed?
    15·1 answer
  • Jasmine makes a note card about series circuits. She records the points shown. Which change will correct the error on her note c
    11·2 answers
  • Imagine that Kevin can instantly transport himself between Planet X and Planet Y. Which statement could be said about Kevin in t
    5·2 answers
  • A drone traveling horizontally at 110 m/s over flat ground at an elevation of 3000 meters must drop an emergency package on a ta
    6·1 answer
  • Which element is found in all the acids
    9·2 answers
  • What type of boundary is shown in the diagram?
    7·2 answers
  • Imagine that our Sun were magically and suddenly replaced by a black hole of the same mass (1 solar mass). How would Earth's orb
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!