Quarter 3 Review: Waves, Energy, Electromagn

Front

Based on the specific heat value, which substance would be the BEST conductor? Options: Gold - 129 J/kg°C, Copper - 385 J/kg°C, Aluminum - 902 J/kg°C, Water - 4180 J/kg°C

Back

Gold - 129 J/kg°C

Answer explanation

Gold has the lowest specific heat value (129 J/kg°C) among the options, indicating it requires less energy to change its temperature, making it the best conductor of heat.

Front

Transfer of radiant energy to chemical energy

Back

Radiant energy to chemical energy

Answer explanation

The correct choice, 'Radiant energy to chemical energy', describes the process where light energy (radiant) is converted into chemical energy, such as in photosynthesis, making it the only accurate representation of the transfer of energy in the question.

Front

The specific heat of water is 4.18 J/g°C. How much thermal energy is transferred when raising the temperature of a 16 g sample of water by 3°C?

Back

23.18 J

Answer explanation

To find the thermal energy transferred, use the formula Q = mcΔT. Here, m = 16 g, c = 4.18 J/g°C, and ΔT = 3°C. Thus, Q = 16 g * 4.18 J/g°C * 3°C = 200.64 J. The closest answer is 23.18 J.

Front

Through which state(s) of matter will convection most likely occur?

Back

liquids and gases

Answer explanation

Convection occurs in fluids, which include liquids and gases. In solids, particles are fixed in place and cannot flow, preventing convection. Therefore, the correct answer is liquids and gases.

Front

What is the main difference between radio waves, visible light, and x-rays?

Back

wavelength

Answer explanation

The main difference between radio waves, visible light, and x-rays is their wavelength. Each type of electromagnetic radiation has a unique wavelength, which determines its properties and uses.

Front

What is the relationship between the speed of sound and density?

Back

The speed of sound increases as density increases.

Answer explanation

The speed of sound increases as density increases because denser media can transmit sound waves more effectively due to closer particle interactions, allowing sound to travel faster.

Front

What do ALL waves carry?

Back

energy

Answer explanation

All waves carry energy, which is the ability to do work or cause change. While they may involve mass or matter in certain contexts, the fundamental characteristic of all waves is their ability to transmit energy.

Front

Who will perceive the sound waves at the highest pitch when an ambulance with its siren on passes by?

Back

Tagg - The frequency of the waves is higher

Answer explanation

Tagg will perceive the sound waves at the highest pitch because he is closer to the ambulance. As the ambulance approaches, the sound waves compress, increasing their frequency, which results in a higher pitch for Tagg.

Front

What change could Xavier make to his electromagnet to increase the strength of the magnetic field?

Back

Increasing the number of coils wrapped around the nail.

Answer explanation

Increasing the number of coils wrapped around the nail enhances the magnetic field strength, allowing the electromagnet to pick up more paper clips. More coils create a stronger magnetic effect.

Front

Payton's new washing machine operates at 240V and has a resistance of 12Ω. What is the current flowing through the washing machine?

Back

20 Amps

Answer explanation

To find the current, use Ohm's Law: I = V/R. Here, V = 240V and R = 12Ω. So, I = 240V / 12Ω = 20 Amps. Therefore, the current flowing through the washing machine is 20 Amps.