Scientific Concepts and Measurements

The video tutorial covers various topics for level 7 students, starting with an introduction to competency. It explains the concept of valency and provides the symbols for different elements. The tutorial then discusses the frequency ranges of various animals and concludes with temperature conversions and refractive index calculations.

What does the term 'competency' refer to?

• The speed of light in a vacuum

• The range of frequencies an animal can hear

• The ability to do something successfully

• The power to combine elements

What is the valency of aluminum?

• +3

• +1

• -1

• +2

Which symbol represents the element sodium?

• N

• O

• S

• Na

What is the frequency range of a human?

• 500 to 2500 Hz

• 500 to 4000 Hz

• 8000 to 100000 Hz

• 500 to 5000 Hz

Which animal has a frequency range of 12000 to 100000 Hz?

• Dog

• Rat

• Cat

• Grasshopper

What is the boiling point of water in Fahrenheit?

• 32°F

• 100°F

• 212°F

• 373.2°F

What is the human body temperature in Celsius?

• 100°C

• 37°C

• 32°C

• 212°C

What is the refractive index of water?

• 1.00

• 1.51

• 1.33

• 2.00

How is the speed of light in a material calculated?

• By dividing the speed of light in vacuum by the refractive index

• By multiplying the speed of light in vacuum by the refractive index

• By adding the speed of light in vacuum to the refractive index

• By subtracting the refractive index from the speed of light in vacuum

What is the speed of light in glass if its refractive index is 1.51?

• 150,000 km/s

• 225,563 km/s

• 200,000 km/s

• 300,000 km/s