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Compound interest maths Quiz class 8

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Questions and Answers

Which of the following is a form of electromagnetic radiation?

X-rays (correct)

Earth's magnetic field

Sound waves

Ocean waves

What determines the color of an object?

Its weight

The material it is made of

Its density

The wavelength of light it reflects (correct)

What is the speed of light in a vacuum?

$4 \times 10^8$ meters per second

$1 \times 10^8$ meters per second

$3 \times 10^8$ meters per second (correct)

$2 \times 10^8$ meters per second

Which of the following best describes the behavior of light when it passes from one medium to another?

It can speed up, slow down, or change direction Signup and view all the answers

What is the formula for compound interest?

P(1 + r)^n Signup and view all the answers

If the principal amount is $1000, the annual interest rate is 5%, and it is compounded annually, what will be the amount after 2 years?

$1102.50 Signup and view all the answers

In compound interest, what does 'n' represent in the formula P(1 + r/n)^(nt)?

Number of times interest is compounded per year Signup and view all the answers

If the principal amount is $5000, the annual interest rate is 8%, and it is compounded semiannually, what will be the amount after 3 years?

$6103.81 Signup and view all the answers

In compound interest, if the principal amount is $2000, the annual interest rate is 6%, and it is compounded quarterly, what will be the amount after 3 years?

$2401.44 Signup and view all the answers

What does 'n' represent in the compound interest formula P(1 + r/n)^(nt)?

Number of times interest is compounded per year Signup and view all the answers

What determines the color of an object?

Wavelength of light it reflects Signup and view all the answers

Which of the following is a form of electromagnetic radiation?

X-rays Signup and view all the answers

Study Notes

Electromagnetic Radiation

Electromagnetic radiation includes forms such as light

Color of an Object

The color of an object is determined by the wavelengths of light it absorbs or reflects

Speed of Light

The speed of light in a vacuum is a constant value

Behavior of Light

When light passes from one medium to another, it is refracted, or bent, due to the change in speed

Compound Interest

The formula for compound interest is P(1 + r/n)^(nt)
In the formula, 'n' represents the number of times the interest is compounded per year
If the principal amount is $1000, the annual interest rate is 5%, and it is compounded annually, the amount after 2 years will be $1102.50
If the principal amount is $5000, the annual interest rate is 8%, and it is compounded semiannually, the amount after 3 years will be $6431.19
If the principal amount is $2000, the annual interest rate is 6%, and it is compounded quarterly, the amount after 3 years will be $3942.19