What happens to frequency and speed of water wave as it goes to shallow region? 2019PPp1q23

Once the wave is produced, the frequency remains constant. Hence speed V of the wave is directly proportional to the wavelength of the wave.

Answer: Option C

Energy dissipated by resistor in one period based on CRO waveform 2020PPp1q40

Answer: Option C

What is the resistance of Y when its length is doubled and diameter three times larger? 2018PPp1q31

When question states that radius or diameter is increased by 3 times, that note that cross-sectional area does not increase by 3 times. It increases by 9 times due to the square. Refer to this question to learn the concetps.

Answer: Option A