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FY SET1R2 Physics (June 2025)
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A beam of red light with a wavelength of 900 nm is incident on a photoelectric material. The quantum energy of beam of red light is _____. (h = 6x10-34 Js, c = 3x108 ms-1)
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The sound from a trumpet radiates uniformly to all direction in air. At distance 6 cm from the trumpet, the sound intensity level 50 dB. For sound intensity level 30 dB, the distance is ______.
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Radioactive material has a half-Life of 2 minutes. If you begin with 512000 radioactive atoms, approximately how many would you except to have after 8 min?
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With a pulley system, the actual mechanical advantage is 6. The efficiency of the pulley system is 60%, the distance moved by the load to a height of 2m. When friction is neglected, the distance moved by the applied force is _______.
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A person produces 150 kcal h-1 of waste heat. If all this heat is dissipated by evaporation of sweat, how much sweat per hour is required? (LV= 580 kcal kg-1)
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The protons are injected with 3.2 x10-19 N at a speed of 2x 105 ms-1 and a magnetic field is applied to make them move in a circular path ( r = 200m). The magnetic flux density of the field required for protons move in the circular path is _______.
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Blood is pumped from the heart of a rate of 5 litres per minutes (83 x 10-6 m3s-1) into the aorta of 10-3 m².The velocity of Blood through the aorta is ______(1 liter = 103 cm3)
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A certain single negatively charged ions (m = 6 X 10-27 kg, q = 1.5 X 10-19 C) is held stationary in an electric field between two horizontal parallel plates, the magnitude of the field, intensity is ________.
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A man who wears glasses of power 3D must hold a newspaper at least 25 cm away to see the print clearly. If he took off the glasses and still wanted clear vision, the distance between the newspaper and him is _______.
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A student uses a 200W electric immersion heater to heat 0.2 kg of water from 20°C to 100°C to make a cup of tea, the time required is ______. (cw = 4.2 Jkg-1 °C )
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