Question 1

1. electrons

2. E=Pt

   P=VI

   E=VIt

   150 = 300 x 30x10^-3 I

   I = 16.67

3. To reduce friction and prevent burns on skin

4. Adhesive pads - There is minimal direct contact between doctor and patient, increasing safety. It is also small and portable

   Insulating handles - Insulation protects the doctor applying the treatment. Contact time is less and can be removed easily.

Question 2

1. v = f lamda

   3x10^8 = 550x10^9f

   f = 5.4x10^4

2. Red

3. Frequency

4. The person believes the fish is in a different location because of refraction. The light from the fish bends away from the normal as it travels from the water into the air. However, the human eye expects light to travel in a straight line and therefore the person believes that the fish is in a different location to where it really is.

5. It changes the focal point of the light rays so that they meet on the retina.

Question 3

1. It releases CO2 into the atmosphere

2. It has one more neutron

3. 3

4. 2.8 x 10^11 = (3x10^8)^2 m

   m = 2.8 x 10^-11 / (3x10^8)^2

   m = 3.11 x 10^-28 kg

5. 9.7GJ = 9.7 x 10^9

   9.7 x 10^9 / 2.8 x 10^11 = 3.46×10^20

6. 0.35 = 1.5x10^9 / I/P

   I/P = 1.5x10^9 / 0.35

   I/P = 4.3 x 10^8 W

Question 4

Question 5