CIE iGCSE Co-Ordinated Science P3.3 Electromagnetic spectrum Exam Style Questions Paper 3
Question
3. (a) (i) State which wave in the electromagnetic spectrum has the highest frequency.
▶️Answer/Explanation
Answer: γ-ray
Sub-topic Code: P5.1 (Electromagnetic Spectrum)
Detailed Solution: Gamma rays (γ-rays) have the highest frequency in the electromagnetic spectrum, making them the most energetic type of electromagnetic radiation.
3. (a) (ii) State which wave is emitted by a remote control for a television.
▶️Answer/Explanation
Answer: infrared
Sub-topic Code: P5.1 (Electromagnetic Spectrum)
Detailed Solution: Remote controls for televisions emit infrared waves, which are used to send signals to the TV.
3. (b) (i) State the effect shown by the ray of light at B in Fig. 3.1.
▶️Answer/Explanation
Answer: refraction
Sub-topic Code: P6.1 (Light)
Detailed Solution: The ray of light at B undergoes refraction, which is the bending of light as it passes from one medium (air) to another (glass).
3. (b) (ii) State the name of the line labelled PQ in Fig. 3.1.
▶️Answer/Explanation
Answer: normal
Sub-topic Code: P6.1 (Light)
Detailed Solution: The line labelled PQ is called the normal, which is an imaginary line perpendicular to the surface at the point where the light ray enters the glass block.
3. (b) (iii) State the value of angle x in Fig. 3.1.
▶️Answer/Explanation
Answer: 45°
Sub-topic Code: P6.1 (Light)
Detailed Solution: Angle x is the angle of refraction, which is given as 45° in the diagram.
3. (b) (iv) The glass block in Fig. 3.1 is resting on a bench. The glass block exerts a pressure on the bench. State the two variables that must be measured to determine the pressure exerted.
▶️Answer/Explanation
Answer: force / mass / weight; area
Sub-topic Code: P2.1 (Forces)
Detailed Solution: To calculate pressure, you need to measure the force (or weight) exerted by the glass block and the area of contact between the block and the bench. Pressure is calculated as force divided by area.
3. (b) (v) The mass of the glass block is 156 g. The volume of the glass block is 60.0 cm³. Calculate the density of the glass block.
▶️Answer/Explanation
Answer: 2.60 g/cm³
Sub-topic Code: P4.1 (Density)
Detailed Solution: Density is calculated as mass divided by volume. For the glass block, density = 156 g / 60.0 cm³ = 2.60 g/cm³.
3. (c) (i) Place α-particles, β-particles, and γ-rays in order of their ionising ability.
▶️Answer/Explanation
Answer: α, β, γ
Sub-topic Code: P12.1 (Radioactivity)
Detailed Solution: α-particles have the highest ionising ability, followed by β-particles, and γ-rays have the least ionising ability.
3. (c) (ii) State which one of these radiations is negatively charged.
▶️Answer/Explanation
Answer: β
Sub-topic Code: P12.1 (Radioactivity)
Detailed Solution: β-particles are negatively charged, as they are high-energy electrons.
3. (c) (iii) State which one of these radiations is the most penetrating.
▶️Answer/Explanation
Answer: γ
Sub-topic Code: P12.1 (Radioactivity)
Detailed Solution: γ-rays are the most penetrating type of radiation, as they can pass through most materials, including thick layers of concrete or lead.