Question 1: Explain in your own words why ultraviolet (UV) radiation can be harmful to human skin.

Answer: Ultraviolet radiation can damage skin cells and cause burns or increase the risk of skin cancer because it has enough energy to cause chemical changes in DNA.

Question 2: Identify which part of the electromagnetic spectrum is most commonly used in solar panels for renewable energy.

Answer: Infrared radiation

Question 3: Describe one safety precaution that should be taken when working with ultraviolet light in renewable energy installations.

Answer: Wearing protective clothing and UV-resistant goggles to prevent skin and eye damage.

Question 4: Calculate the energy of a photon of visible light with a wavelength of 500 nm. (Use E = hc/λ, where h = 6.63×10⁻³⁴ Js, c = 3×10⁸ m/s, and λ in meters).

Answer: E = 3.98×10⁻¹⁹ Joules

Question 5: In a hydroelectric power station, what safety measure should be taken to protect workers from electrical hazards?

Answer: Ensuring proper grounding and insulation of electrical equipment, and wearing protective gear.

Question 6: Which part of the electromagnetic spectrum, used in geothermal heat pumps, poses a minimal risk to human health?

Answer: Infrared radiation

Question 7: List two possible health risks associated with prolonged exposure to radio waves used in some renewable energy communication systems.

Answer: Potential tissue heating and interference with medical devices such as pacemakers.

Question 8: Explain the importance of safety measures when installing photovoltaic solar panels in urban environments.

Answer: Safety measures are important to prevent electrical shocks, fire hazards, and exposure to harmful UV radiation. Proper handling of electrical connections, wearing protective gear, and ensuring panels are installed in secure, weather-resistant mounts are essential to protect workers and the public.

Question 9: Describe a practical experiment to test the safety effectiveness of UV protective goggles used in solar panel manufacturing.

Answer: The experiment involves exposing UV light to goggles and measuring the transmitted UV intensity with a UV sensor, comparing it to no-goggle exposure to verify protective effectiveness.

Question 10: In the context of wind turbines, what safety precautions are necessary for maintenance workers to avoid exposure to electromagnetic interference?

Answer: Maintaining safe distances from electromagnetic sources, using shielding equipment, and following proper procedures during maintenance.