Photons with the highest frequency have the lowest ____

An engine absorbs 2150 J as heat from a hot reservoir and gives off 750 J as heat to a cold reservoir during each cycle. What is

tia_tia [17]

Answer:

65.2 %

Explanation:

Let Q1 = Heat absorbed by the system

Q2 = Heat released by the system

e= (1 - (Q2/Q1)) x 100

e= (1 - (750/2150)) x 100

e= (1 - 0.348) x 100

e= 0.652 x 100

e= 65.2 %

6 0

4 years ago

You know that you sound better when you sing in the shower. This has to do with the amplification of frequencies that correspond

Elena L [17]

Answer:

Explanation:

For first overtone

Standing waves will be formed lengthwise and breadth-wise in the enclosures having dimension of .75m x 1.5 m

A ) For the formation of lowest two frequencies formed by standing waves along the breadth , fundamental note and first overtone may be considered.

For fundamental note ,

the condition is

wave length λ = 2L = 2 x 0.75 m

λ = 1.5 m

frequency n = v / λ

= 343 / 1.5

= 229 Hz approx

For first overtone

λ = L = 0.75m

frequency n = v / λ

n = 343 / 0.75

= 457 Hz approx

B)

For the formation of lowest two frequencies formed by standing waves along the length , fundamental note and first overtone may be considered.

For fundamental note ,

the condition is

wave length λ = 2L = 2 x 1.5 m

λ = 3 m

frequency n = v / λ

= 343 / 3

= 114 Hz approx

frequency n = v / λ

n = 343 / 1.5

= 229 Hz approx

3 0

3 years ago

An airplane is flying horizontally with a constant momentum during a time interval ?t. (a) Is there a net impulse acting on the

goldenfox [79]

Answer:

Explanation:

Given

Airplane is flying with horizontally with a constant momentum during time interval $\Delta t$

Impulse is given by change in momentum, so there is no net impulse on the Plane because momentum is constant

(b) As there is no change in momentum therefore impulse of thrust and air drag is balanced i.e. both are equal in magnitude but act in opposite direction

7 0

3 years ago

If your front lawn is 16.016.0 feet wide and 20.020.0 feet long, and each square foot of lawn accumulates 13501350 new snowflake

asambeis [7]

Answer:

The mass of snow accumulated in the lawn in 1 hour equals 57.024 kilograms

Explanation:

Given

Width of lawn = 16 feet

Length of lawn = 20 feet

Thus total area of lawn equals $16\times 20=320sq.feet$ \

Now it is given that 1 square foot accumulates 1350 new snowflakes each minute thus number of snowflakes accumulated by 320 square feet in 1 minute equals

$320\times 1350=432000$