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labwork [276]
4 years ago
8

A radio wave has a frequency of 3.20 × 108 hz. what is the energy (in j) of one photon of this radiation? enter your answer in s

cientific notation. × 10 j
Physics
1 answer:
sergij07 [2.7K]4 years ago
7 0
The formula to be used in this problem is:E = hν
Where:
ν = frequency in Hz, or s^-1.
From time to time you see E = hf.
h = 6.636 x 10^-34 J.s and is named as Planck's constant. 

E = (6.636 x 10^-34 J.s)(3.20 x 10^8 s^-1)= 2.12352 x 10^-25 JThis is the energy of 1 photon.
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7. A stereo is able to convert 20% of its electrical energy into sound. If 1000 J of sound energy is produced, calculate the ele
Sonja [21]

Answer:

As 20/100 E= 1000

E= 10,000/2

=5000J

3 0
3 years ago
A student builds a rocket-propelled cart for a science project. Its acceleration is not quite high enough to win a prize, so he
irina [24]

Answer:

Explanation:

a = F / m

where a is acceleration , F is thrust and m is mass

taking log and differentiating

da / a = dF / F - dm / m

(da / a)x 100 = (dF / F)x100 - (dm / m) x100

percentage increase in a = percentage increase in F - percentage increase in m

= percentage increase in acceleration a   = 39 - 13 = 26 %

required increase = 26 %.

5 0
3 years ago
How do massive stars change the atmosphere?
Wewaii [24]
Not sure what you're referring to... our atmosphere is mostly nitrogen/oxygen - both gases were created by very massive stars, many times greater than our sun - our sun isn't massive enough to create the gases needed for our atmosphere...
6 0
3 years ago
A car moves with an initial velocity of 19 m/s due north. (Part A) Find the velocity of the car after 5.6 s if its acceleration
galben [10]

Answer

Assuming

east is the positive x direction

north is the positive y direction

initial velocity , u = 19 j m/s

a) acceleration , a = 1.6 j m/s^2

Using first equation of motion

v = u + a × t

v = 19 + 5.6× 1.6

v = 28 j m/s

the velocity of the car after 5.6 s is 28 m/s north

b)

acceleration , a = -1.5 j m/s^2

Using first equation of motion

v = u + a × t

v = 19 - 5.6 ×1.5

v = 10.6 j m/s

the velocity of the car after 5.6 s is 10.6 m/s north

5 0
3 years ago
Very easy physics maths about current and other stuffs only one question please help me
Reil [10]

Answer:

The total voltage of the circuit is 18 volts.

Explanation:

We have, three identical resistors of resistance 3 ohms are connected in series in a circuit.

For a series combination, the equivalent resistance is given by the sum of individual resistances i.e.

R_{eq}=R_1+R_2+R_3\\\\R_{eq}=3+3+3\\\\R_{eq}=9\ \Omega

Let V is the voltage of the battery if the current in the circuit is 2 A. So,

V=IR

V=2\times 9\\\\V=18\ V

So, the total voltage of the circuit is 18 volts.

7 0
3 years ago
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