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vlabodo [156]
4 years ago
14

beautiful patterns are formed in a kaleidoscope because of multiple reflection . explain and specify how it is different from a

periscope by diagrams.

Physics
1 answer:
Ivahew [28]4 years ago
8 0

Periscope is a tube containing mirrors or prisms for seeing things which are otherwise not possible to see due to some obstacle. Two mirrors are aligned at 45 degrees through which light bounces off and enables the observer to see beyond the obstacle. This is specially used in submarines.

A kaleidoscope is an optical device which contains mirrors and colored glass pieces in a tube. When the tube is rotated, beautiful patterns are formed due to multiple reflections.  

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For every 120 joules of energy input a car wastes 85 joules , find the useful energy output of the car ?
Tamiku [17]

Answer:

35 Joules

Explanation:

Applying

Input Energy(Q) = Useful energy output(U)+Wasted Energy(W)

Q = U+W.............................. Equation 1

Make U the subject of the equation

U = Q-W................... Equation 2

From the question,

Given: Q = 120 Joules, W = 85 Joules

Substitute these values into equation 2

U = 120-85

U = 35 Joules

6 0
3 years ago
A particle undergoes two displacements. The first has a magnitude of 11 m and makes an angle of 82 ◦ with the positive x axis. T
Luden [163]

Answer:

\theta = 211.7 degree

Explanation:

First displacement of the particle is given as

r_1 = 11 m at 82 degree with positive X axis

so we can say

\vec r_1 = 11 cos82 \hat i + 11 sin82 \hat j

\vec r_1 = 1.53\hat i + 10.9 \hat j

resultant displacement of the particle after second displacement is given as

r = 8.7 m at 135 degree with positive X axis

so we can say

r = 8.7 cos135\hat i + 8.7 sin135\hat j

r = -6.15 \hat i + 6.15 \hat j

now we know that

r = r_1 + r_2

now we have

r_2 = r - r_1

so we will have

r_2 = (-6.15 \hat i + 6.15 \hat j) - (1.53\hat i + 10.9 \hat j)

r_2 = -7.68 \hat i - 4.75 \hat j

so angle of the second displacement is given as

tan\theta = \frac{r_y}{r_x}

tan\theta = \frac{-4.75}{-7.68}

\theta = 211.7 degree

8 0
3 years ago
Pls help ASAP
12345 [234]

Answer:

a. 4.733 × 10⁻¹⁹ J = 2.954 eV b i. yes ii. 0.054 eV = 8.651 × 10⁻²¹ J

Explanation:

a. Find the energy of the incident photon.

The energy of the incident photon E = hc/λ where h = Planck's constant = 6.626 × 10⁻³⁴ Js, c = speed of light = 3 × 10⁸ m/s and λ = wavelength of light = 420 nm = 420 × 10⁻⁹ m

Substituting the values of the variables into the equation, we have

E = hc/λ

= 6.626 × 10⁻³⁴ Js × 3 × 10⁸ m/s ÷ 420 × 10⁻⁹ m

= 19.878 × 10⁻²⁶ Jm  ÷ 420 × 10⁻⁹ m

= 0.04733 × 10⁻¹⁷ J

= 4.733 × 10⁻¹⁹ J

Since 1 eV = 1.602 × 10⁻¹⁹ J,

4.733 × 10⁻¹⁹ J = 4.733 × 10⁻¹⁹ J × 1 eV/1.602 × 10⁻¹⁹ J = 2.954 eV

b. i. Is this energy enough for an electron to leave the atom

Since E = 2.954 eV is greater than the work function Ф = 2.9 eV, an electron would leave the atom. So, the answer is yes.

ii. What is its  maximum energy?

The maximum energy E' = E - Ф = 2.954 - 2.9

= 0.054 eV

= 0.054 × 1 eV

= 0.054 × 1.602 × 10⁻¹⁹ J

= 0.08651  × 10⁻¹⁹ J

= 8.651 × 10⁻²¹ J

7 0
3 years ago
Name and state the rule to find out the direction of magnetic field inside and around the loop.
goldfiish [28.3K]

Answer:

The right hand rule states that: to determine the direction of the magnetic force on a positive moving charge, ƒ, point the thumb of the right hand in the direction of v, the fingers in the direction of B, and a perpendicular to the palm points in the direction of F.

Explanation:

5 0
3 years ago
Can someone check my answers please??
loris [4]
I checked them they are good.
3 0
4 years ago
Read 2 more answers
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