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
faltersainse [42]
3 years ago
12

A quantum of electromagnetic radiation has an energy of 2.0 kev. what is its frequency? planck's constant is 6.63 × 10−34 j · s.

answer in units of hz.
Physics
1 answer:
xxMikexx [17]3 years ago
8 0
A quantum of electromagnetic radiation is called photon, and the energy of a photon is given by
E=hf (1)
where h is the Planck constant and f is the frequency of the photon.

In this problem, the photon energy is
E=2.0 keV=2.0 \cdot 10^3 eV=3.2 \cdot 10^{-16} J
If we re-arrange equation (1), we can find the energy of the photon:
f= \frac{E}{h}= \frac{3.2 \cdot 10^{-16} J}{6.6 \cdot 10^{-34} Js}=4.8\cdot 10^{17} Hz
You might be interested in
A 50.0 ohm and a 30.0 ohm resistor are connected in parallel. What is their equivalent resistance? Unit=Ohms
Alchen [17]

R(parallel) = product/ sum

50×30/50+30

1500/80

18,75 ohms

4 0
3 years ago
Which term describes the increase in a material's volume due to an increase in temperature?
AlladinOne [14]
Thermal Expansion.  best describes the increase in a materials volume 
7 0
3 years ago
Read 2 more answers
A lizard accelerates from 2 m/s to 10 m/s in 4 seconds. what is the lizard average acceleration
VLD [36.1K]

Acceleration = (change in speed) / (time for the change)

change in speed = (ending speed) - (starting speed)

change in speed = (10 m/s) - (2 m/s)  =  8 m/s

Acceleration = (8 m/s) / (4 sec)

Acceleration = (8/4) (m/s²)

<em>Acceleration = 2 m/s²</em>

8 0
3 years ago
The roller coaster is designed according to safety regulations that prohibit the speed of the car from exceeding 20 m/s. find th
hram777 [196]

maximum allowed value of the speed in roller coaster is given as

v = 20 m/s

now from kinematics we can say

v^2 - v_i^2 = 2 a s

here initial speed will be

v_i = 0

acceleration is due to gravity

a = 9.8 m/s^2

now we can use this to find the height

20^2 - 0^2 = 2 * 9.8* h

400 = 19.6 *h

h = 20.4 m

so maximum allowed height will be 20.4 m

4 0
3 years ago
Define average velocity.Immersive Reader
vagabundo [1.1K]

Answer:

The slope of a graph of position vs time

4 0
3 years ago
Other questions:
  • Mandeep is filling quart containers with different craft materials. Which of the following materials would give a container the
    9·1 answer
  • According to thomas gage's spies, in which town had the minutemen been collecting a large amount of arms?
    15·2 answers
  • What approximate "weight" is an astronaut on the moon if his mass is 80 kg? A. 128 N B. 176 N C. 784 N D. 50 N
    6·2 answers
  • How big is a ton? That is, what is the volume of something that weighs a ton? To be specific, estimate the diameter of a 1-ton r
    9·1 answer
  • "A positively-charged particle is held at point A between two parallel metal plates. The plate on the left has a net positive ch
    7·1 answer
  • the diagram deliver of uniform mass supported at the middle point six Queens of equal mass are placed at mark 4 on on the lift h
    14·1 answer
  • Can someone please explain to me why the net force of the ball changes in the Y direction and not the X Direction? I made little
    7·1 answer
  • A 0.25-kilogram ball is observed to accelerate at 4,000 m/sec2 as it is hit with a bat.
    7·1 answer
  • Which burrito will heat up faster .03oz or .05 oz
    14·1 answer
  • 3. Which of these will remain unchanged when a sound wave travels from the air to water?
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!