The ground state energy of a hydrogen atom is −13.6eV. The energy needed to ionize the hydrogen atom from its second excited state will be:
1. 13.6eV
2. 6.8eV
3. 1.51eV
4. 3.4eV
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Subtopic: Bohr's Model of Atom |
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The escape velocity of a body on the earth's surface is 11.2km/s. If the same body is projected upward with a velocity 22.4km/s, the velocity of this body at an infinite distance from the centre of the earth will be:
1.
11.2√2km/s
2.
zero
3.
11.2km/s
4.
11.2√3km/s
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Subtopic: Escape velocity |
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A lens is made up of 3 different transparent media as shown in the figure. A point object O is placed on its axis beyond 2f. How many real images will be obtained on the other side?
1. 2
2. 1
3. No image will be formed
4. 3
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Subtopic: Lenses |
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The diameter of a spherical bob, when measured with vernier callipers yielded the values: 3.33 cm, 3.32 cm, 3.34 cm, 3.33 cm and 3.32 cm. The mean diameter to appropriate significant figures is:
1. 3.328 cm
2. 3.3 cm
3. 3.33 cm
4. 3.32 cm
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Subtopic: Measurement & Measuring Devices |
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The position of a particle is given by; →r(t)=4t^i+2t2^j+5^k, where t is in seconds and r in metres. Find the magnitude and direction of the velocity v(t), at t=1s, with respect to the x-axis.
1. 4√2ms−1,45∘
2. 4√2ms−1,60∘
3. 3√2ms−1,30∘
4. 3√2ms−1,45∘
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Subtopic: Speed & Velocity |
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