Question

7. Which of the following is placing transferred through coco A pot of hot water heats up a ctal spoon placed in the water A light bulb heats up air by releasing visible photos O Currents move warm air from one part of a room to another. O All of the above are examples of convection Two sound waves have the same frequency different amplitudes. Which of the following describes how the two waves would sound? The waves would have different pitch and the same loudness The waves would have the same pitch and different loudness. The waves would have the same pitch and the same loudness O The waves would have different pitch and different loudness. 9. Two light bulbs, one with resistance 10 and another with resistance are each separately connected to identical batteries. How do the currents through the light bulbs compare? The lower-resistance light bulb has more current passing through it. The lower-resistance light bulb has less current passing through it. The two light bulbs have the same current passing through them. We cannot compare the currents without also knowing the power output of each light bulb. 10. Imagine two identical light bulbs with resistance of 120 ne connected in two circuits: one with current 3 A, and one with current 6 A. Which of the following is true? The light bulb in the 6 A circuit will use four times as much power as the light bulb in the 3 A circuit. O The light bulb in the 6 A circuit will use twice as much power as the light bulb in the 3 A circuit. O The two light bulbs will use the same amount of power. O The light bulb in the 3 A circuit will use twice as much power as the light bulb in the 6 A circuit The light bulb in the 3 A circuit will use four times as much power as the light bulb in the 6 A circuit. 11. An electron is located exactly halfway between two charges charge A with 4.--2C, and charge B with qs - +4C. Which of the following is true? O The electron will feel pulled towards both charge A and charge B. O The electron will feel repelled from both charge A and charge B. O The electron will feel pulled towards charge A and repelled from charge B. The electron will feel pulled towards charge B and repelled from charge A. 12. A proton is located in between two electrons. Electron A is 2 m directly to the right of the proton, and electron B is 4 m directly to the left of the proton. Which of the following is true! O The proton will feel four times as much force due to electron A as it does due to electron B The proton will feel twice as much force due to electron A as it does due to electron B. The proton will feel the same force due to both electrons. O The proton will feel twice as much force due to electron B as it does due to electron A. O The proton will feel four times as much force due to electron B as it does due to electron A.

Answer 1

Sol: 1 Heat * Connection of heat transferred through convection. heat transfer is associated with transfer from one place to another by mouement of fluid * Option In all option heat is being transferred by mowment a of fuit in option – water is fluid which warms spoon . ③ - light bulb heats air by connection - mouement of warm air is by convention Pitch of sound is characteristic of sound which depends on frequency Loudness depends on Aplitude. Gwen as frequency a same - so - Pitch is same - Amplitude a different so loudness is different w opa'in 6 9 o connected to identical battery R, = lon R2-54 song of EMAN . so, current = 5 Ink (empre un temal? do, bigger R Cie R, ) will have light low and comm R Cie R2) will have high current option @ Ro= 12er I, =BA, IZ = 6A Рото, а тR - Pia 32 12 = 108 w . P2 = P2=4 (6)²x12 = 4320 → P2 is 4 times pi 12 - 4 option ®